31977140560 has 40 divisors (see below), whose sum is σ = 74355069096. Its totient is φ = 12789442560.

The previous prime is 31977140509. The next prime is 31977140561. The reversal of 31977140560 is 6504177913.

It can be written as a sum of positive squares in 4 ways, for example, as 354342976 + 31622797584 = 18824^2 + 177828^2 .

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

It is a super-2 number, since 2×31977140560² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31977140561) by changing a digit.

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, 1000020 + ... + 1031500.

Almost surely, 2^31977140560 is an apocalyptic number.

It is an amenable number.

31977140560 is an abundant number, since it is smaller than the sum of its proper divisors (42377928536).

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

31977140560 is a wasteful number, since it uses less digits than its factorization.

31977140560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44191 (or 44185 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 43.

The spelling of 31977140560 in words is "thirty-one billion, nine hundred seventy-seven million, one hundred forty thousand, five hundred sixty".