31900764 has 72 divisors (see below), whose sum is σ = 87333120. Its totient is φ = 9036384.

The previous prime is 31900717. The next prime is 31900831. The reversal of 31900764 is 46700913.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133357 + ... + 133595.

It is an arithmetic number, because the mean of its divisors is an integer number (1212960).

Almost surely, 2^31900764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31900764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43666560).

31900764 is an abundant number, since it is smaller than the sum of its proper divisors (55432356).

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

31900764 is a wasteful number, since it uses less digits than its factorization.

31900764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 31900764 is about 5648.0761326314. The cubic root of 31900764 is about 317.1516886244.

The spelling of 31900764 in words is "thirty-one million, nine hundred thousand, seven hundred sixty-four".