31864404 has 96 divisors (see below), whose sum is σ = 90316800. Its totient is φ = 8611200.

The previous prime is 31864397. The next prime is 31864423. The reversal of 31864404 is 40446813.

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 31 ways as a sum of consecutive naturals, for example, 52897 + ... + 53495.

It is an arithmetic number, because the mean of its divisors is an integer number (940800).

Almost surely, 2^31864404 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 31864404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45158400).

31864404 is an abundant number, since it is smaller than the sum of its proper divisors (58452396).

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

31864404 is a wasteful number, since it uses less digits than its factorization.

31864404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 31864404 is about 5644.8564197861. The cubic root of 31864404 is about 317.0311479443.

The spelling of 31864404 in words is "thirty-one million, eight hundred sixty-four thousand, four hundred four".