31323957990 has 32 divisors (see below), whose sum is σ = 80960384736. Its totient is φ = 7710512640.

The previous prime is 31323957989. The next prime is 31323958019. The reversal of 31323957990 is 9975932313.

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 15 ways as a sum of consecutive naturals, for example, 40158531 + ... + 40159310.

It is an arithmetic number, because the mean of its divisors is an integer number (2530012023).

Almost surely, 2^31323957990 is an apocalyptic number.

31323957990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31323957990 is an abundant number, since it is smaller than the sum of its proper divisors (49636426746).

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

31323957990 is a wasteful number, since it uses less digits than its factorization.

31323957990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80317864.

The product of its (nonzero) digits is 1377810, while the sum is 51.

The spelling of 31323957990 in words is "thirty-one billion, three hundred twenty-three million, nine hundred fifty-seven thousand, nine hundred ninety".