31593979872 has 288 divisors, whose sum is σ = 112142983680. Its totient is φ = 8214635520.

The previous prime is 31593979867. The next prime is 31593979897. The reversal of 31593979872 is 27897939513.

31593979872 is a `hidden beast` number, since 3 + 159 + 397 + 98 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×31593979872² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1852279 + ... + 1869257.

It is an arithmetic number, because the mean of its divisors is an integer number (389385360).

Almost surely, 2^31593979872 is an apocalyptic number.

31593979872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31593979872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56071491840).

31593979872 is an abundant number, since it is smaller than the sum of its proper divisors (80549003808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31593979872 is a wasteful number, since it uses less digits than its factorization.

31593979872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17086 (or 17075 counting only the distinct ones).

The product of its digits is 25719120, while the sum is 63.

The spelling of 31593979872 in words is "thirty-one billion, five hundred ninety-three million, nine hundred seventy-nine thousand, eight hundred seventy-two".