31320272664 has 48 divisors (see below), whose sum is σ = 85778854200. Its totient is φ = 10322784384.

The previous prime is 31320272647. The next prime is 31320272723. The reversal of 31320272664 is 46627202313.

31320272664 is a `hidden beast` number, since 3 + 1 + 320 + 272 + 6 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2437434 + ... + 2450249.

Almost surely, 2^31320272664 is an apocalyptic number.

It is an amenable number.

31320272664 is an abundant number, since it is smaller than the sum of its proper divisors (54458581536).

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

31320272664 is a wasteful number, since it uses less digits than its factorization.

31320272664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4887784 (or 4887777 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

Adding to 31320272664 its reverse (46627202313), we get a palindrome (77947474977).

The spelling of 31320272664 in words is "thirty-one billion, three hundred twenty million, two hundred seventy-two thousand, six hundred sixty-four".