31388680224 has 96 divisors (see below), whose sum is σ = 99873103680. Its totient is φ = 9511718400.

The previous prime is 31388680217. The next prime is 31388680241. The reversal of 31388680224 is 42208688313.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 31388680224.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1641837 + ... + 1660844.

It is an arithmetic number, because the mean of its divisors is an integer number (1040344830).

Almost surely, 2^31388680224 is an apocalyptic number.

It is an amenable number.

31388680224 is an abundant number, since it is smaller than the sum of its proper divisors (68484423456).

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

31388680224 is a wasteful number, since it uses less digits than its factorization.

31388680224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3302711 (or 3302697 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 31388680224 in words is "thirty-one billion, three hundred eighty-eight million, six hundred eighty thousand, two hundred twenty-four".