## George Boole was born on this day 201 years ago.

### Properties of the number 660647:

660647 = 13 × 89 × 571 is a sphenic number and squarefree.660647 has 3 distinct prime factors, 8 divisors, 15 antidivisors and 601920 totatives.

660647 has a prime digit sum 29 in base 10.

Reversing the decimal digits of 660647 results in a sphenic number.

660647 = 330324

^{2}- 330323

^{2}= 25416

^{2}- 25403

^{2}= 3756

^{2}- 3667

^{2}= 864

^{2}- 293

^{2}is the difference of 2 nonnegative squares in 4 ways.

660647 is the sum of 2 positive triangular numbers.

660647 is the difference of 2 positive pentagonal numbers in 3 ways.

660647 is not the sum of 3 positive squares.

660647

^{2}= 289497

^{2}+ 593840

^{2}= 38828

^{2}+ 659505

^{2}= 436815

^{2}+ 495628

^{2}= 254095

^{2}+ 609828

^{2}is the sum of 2 positive squares in 4 ways.

660647

^{2}is the sum of 3 positive squares.

660647 is a divisor of 109

^{132}- 1.

660647 is palindromic in (at least) base 96.

660647 in base 34 = grgr and consists of only the digits 'g' and 'r'.

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