31407157638 has 24 divisors (see below), whose sum is σ = 68052621000. Its totient is φ = 10468471104.

The previous prime is 31407157601. The next prime is 31407157651. The reversal of 31407157638 is 83675170413.

31407157638 is a `hidden beast` number, since 3 + 1 + 4 + 0 + 7 + 1 + 5 + 7 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31407157593 and 31407157602.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 393678 + ... + 466686.

It is an arithmetic number, because the mean of its divisors is an integer number (2835525875).

Almost surely, 2^31407157638 is an apocalyptic number.

31407157638 is an abundant number, since it is smaller than the sum of its proper divisors (36645463362).

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

31407157638 is a wasteful number, since it uses less digits than its factorization.

31407157638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96916 (or 96913 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 31407157638 in words is "thirty-one billion, four hundred seven million, one hundred fifty-seven thousand, six hundred thirty-eight".