31857378872 has 16 divisors (see below), whose sum is σ = 65162820600. Its totient is φ = 14480626720.

The previous prime is 31857378863. The next prime is 31857378877. The reversal of 31857378872 is 27887375813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31857378877) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 181007747 + ... + 181007922.

Almost surely, 2^31857378872 is an apocalyptic number.

It is an amenable number.

31857378872 is an abundant number, since it is smaller than the sum of its proper divisors (33305441728).

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

31857378872 is a wasteful number, since it uses less digits than its factorization.

31857378872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362015686 (or 362015682 counting only the distinct ones).

The product of its digits is 15805440, while the sum is 59.

The spelling of 31857378872 in words is "thirty-one billion, eight hundred fifty-seven million, three hundred seventy-eight thousand, eight hundred seventy-two".