31890641360 has 60 divisors (see below), whose sum is σ = 78763872108. Its totient is φ = 12005879808.

The previous prime is 31890641353. The next prime is 31890641401. The reversal of 31890641360 is 6314609813.

It can be written as a sum of positive squares in 6 ways, for example, as 7661851024 + 24228790336 = 87532^2 + 155656^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 666557 + ... + 712796.

Almost surely, 2^31890641360 is an apocalyptic number.

It is an amenable number.

31890641360 is an abundant number, since it is smaller than the sum of its proper divisors (46873230748).

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

31890641360 is a wasteful number, since it uses less digits than its factorization.

31890641360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379400 (or 1379377 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 31890641360 in words is "thirty-one billion, eight hundred ninety million, six hundred forty-one thousand, three hundred sixty".