31993906188 has 24 divisors (see below), whose sum is σ = 75491241840. Its totient is φ = 10544807680.

The previous prime is 31993906163. The next prime is 31993906201. The reversal of 31993906188 is 88160939913.

It is a super-2 number, since 2×31993906188² (a number of 22 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 14977353 + ... + 14979488.

It is an arithmetic number, because the mean of its divisors is an integer number (3145468410).

Almost surely, 2^31993906188 is an apocalyptic number.

It is an amenable number.

31993906188 is an abundant number, since it is smaller than the sum of its proper divisors (43497335652).

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

31993906188 is a wasteful number, since it uses less digits than its factorization.

31993906188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29956937 (or 29956935 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 57.

The spelling of 31993906188 in words is "thirty-one billion, nine hundred ninety-three million, nine hundred six thousand, one hundred eighty-eight".