Number of the day: 16639721720

Properties of the number 16639721720:

16639721720 = 2³ × 5 × 17 × 101 × 242279 is composite and not squarefree.
16639721720 has 5 distinct prime factors, 64 divisors, 31 antidivisors and 6202316800 totatives.
16639721720 is the difference of 2 nonnegative squares in 16 ways.
16639721720 is the difference of 2 positive pentagonal numbers in 7 ways.
16639721720 = 172² + 490² + 128994² is the sum of 3 positive squares.
16639721720² = 10582746720² + 12840787000² = 7830457280² + 14682107400² = 4768050720² + 15941958200² = 5750734344² + 15614396992² = 2544898616² + 16443960288² = 761725176² + 16622277632² = 9892736128² + 13379615496² = 7047411552² + 15073630264² = 3922981568² + 16170669576² = 11071181184² + 12422128888² = 9983833032² + 13311777376² = 7150137848² + 15025174464² = 3294994400² + 16310222280² is the sum of 2 positive squares in 13 ways.
16639721720² is the sum of 3 positive squares.
16639721720 is a proper divisor of 293⁴⁸⁴⁵⁵⁶ - 1.