31977863390 has 16 divisors (see below), whose sum is σ = 62792895600. Its totient is φ = 11628313920.

The previous prime is 31977863353. The next prime is 31977863443. The reversal of 31977863390 is 9336877913.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145353815 + ... + 145354034.

It is an arithmetic number, because the mean of its divisors is an integer number (3924555975).

Almost surely, 2^31977863390 is an apocalyptic number.

31977863390 is a deficient number, since it is larger than the sum of its proper divisors (30815032210).

31977863390 is a wasteful number, since it uses less digits than its factorization.

31977863390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290707867.

The product of its (nonzero) digits is 5143824, while the sum is 56.

The spelling of 31977863390 in words is "thirty-one billion, nine hundred seventy-seven million, eight hundred sixty-three thousand, three hundred ninety".