31656472420 has 48 divisors (see below), whose sum is σ = 68274964800. Its totient is φ = 12324675200.

The previous prime is 31656472409. The next prime is 31656472427. The reversal of 31656472420 is 2427465613.

It is not an unprimeable number, because it can be changed into a prime (31656472427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13630 + ... + 251989.

It is an arithmetic number, because the mean of its divisors is an integer number (1422395100).

Almost surely, 2^31656472420 is an apocalyptic number.

It is an amenable number.

31656472420 is an abundant number, since it is smaller than the sum of its proper divisors (36618492380).

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

31656472420 is a wasteful number, since it uses less digits than its factorization.

31656472420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265788 (or 265786 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 31656472420 in words is "thirty-one billion, six hundred fifty-six million, four hundred seventy-two thousand, four hundred twenty".