31337312720 has 40 divisors (see below), whose sum is σ = 83267718144. Its totient is φ = 10744221312.

The previous prime is 31337312707. The next prime is 31337312737. The reversal of 31337312720 is 2721373313.

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

It is a super-2 number, since 2×31337312720² (a number of 22 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 27979184 + ... + 27980303.

Almost surely, 2^31337312720 is an apocalyptic number.

It is an amenable number.

31337312720 is an abundant number, since it is smaller than the sum of its proper divisors (51930405424).

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

31337312720 is a wasteful number, since it uses less digits than its factorization.

31337312720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55959507 (or 55959501 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 32.

The spelling of 31337312720 in words is "thirty-one billion, three hundred thirty-seven million, three hundred twelve thousand, seven hundred twenty".