31688505860 has 48 divisors (see below), whose sum is σ = 72674098560. Its totient is φ = 11510615040.

The previous prime is 31688505859. The next prime is 31688505887. The reversal of 31688505860 is 6850588613.

It is a super-2 number, since 2×31688505860² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31688505799 and 31688505808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126857 + ... + 281903.

It is an arithmetic number, because the mean of its divisors is an integer number (1514043720).

Almost surely, 2^31688505860 is an apocalyptic number.

It is an amenable number.

31688505860 is an abundant number, since it is smaller than the sum of its proper divisors (40985592700).

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

31688505860 is a wasteful number, since it uses less digits than its factorization.

31688505860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155996 (or 155994 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 31688505860 in words is "thirty-one billion, six hundred eighty-eight million, five hundred five thousand, eight hundred sixty".