31357664 has 48 divisors (see below), whose sum is σ = 68069232. Its totient is φ = 14128128.

The previous prime is 31357663. The next prime is 31357699. The reversal of 31357664 is 46675313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31357663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17012 + ... + 18764.

It is an arithmetic number, because the mean of its divisors is an integer number (1418109).

Almost surely, 2^31357664 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 31357664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34034616).

31357664 is an abundant number, since it is smaller than the sum of its proper divisors (36711568).

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

31357664 is a wasteful number, since it uses less digits than its factorization.

31357664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819 (or 1811 counting only the distinct ones).

The product of its digits is 45360, while the sum is 35.

The square root of 31357664 is about 5599.7914246872. The cubic root of 31357664 is about 315.3415762255.

The spelling of 31357664 in words is "thirty-one million, three hundred fifty-seven thousand, six hundred sixty-four".