31640464560 has 40 divisors (see below), whose sum is σ = 98085440880. Its totient is φ = 8437457152.

The previous prime is 31640464523. The next prime is 31640464561. The reversal of 31640464560 is 6546404613.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×31640464560² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31640464561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65917395 + ... + 65917874.

It is an arithmetic number, because the mean of its divisors is an integer number (2452136022).

Almost surely, 2^31640464560 is an apocalyptic number.

31640464560 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31640464560 is an abundant number, since it is smaller than the sum of its proper divisors (66444976320).

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

31640464560 is a wasteful number, since it uses less digits than its factorization.

31640464560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131835285 (or 131835279 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 31640464560 in words is "thirty-one billion, six hundred forty million, four hundred sixty-four thousand, five hundred sixty".