31987796 has 12 divisors (see below), whose sum is σ = 56038752. Its totient is φ = 15976728.

The previous prime is 31987771. The next prime is 31987799. The reversal of 31987796 is 69778913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31987799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491 + ... + 8013.

It is an arithmetic number, because the mean of its divisors is an integer number (4669896).

Almost surely, 2^31987796 is an apocalyptic number.

It is an amenable number.

31987796 is a deficient number, since it is larger than the sum of its proper divisors (24050956).

31987796 is a wasteful number, since it uses less digits than its factorization.

31987796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8590 (or 8588 counting only the distinct ones).

The product of its digits is 571536, while the sum is 50.

The square root of 31987796 is about 5655.7754552316. The cubic root of 31987796 is about 317.4398455901.

The spelling of 31987796 in words is "thirty-one million, nine hundred eighty-seven thousand, seven hundred ninety-six".