31810397968 has 40 divisors (see below), whose sum is σ = 64889284320. Its totient is φ = 15065107200.

The previous prime is 31810397947. The next prime is 31810398071. The reversal of 31810397968 is 86979301813.

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 7 ways as a sum of consecutive naturals, for example, 2689668 + ... + 2701468.

It is an arithmetic number, because the mean of its divisors is an integer number (1622232108).

Almost surely, 2^31810397968 is an apocalyptic number.

31810397968 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

31810397968 is an abundant number, since it is smaller than the sum of its proper divisors (33078886352).

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

31810397968 is a wasteful number, since it uses less digits than its factorization.

31810397968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20695 (or 20689 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 31810397968 in words is "thirty-one billion, eight hundred ten million, three hundred ninety-seven thousand, nine hundred sixty-eight".