31326864 has 80 divisors (see below), whose sum is σ = 85946880. Its totient is φ = 9815040.

The previous prime is 31326859. The next prime is 31326881. The reversal of 31326864 is 46862313.

It is a nude number because it is divisible by every one of its digits.

Its product of digits (20736) is a multiple of the sum of its prime factors (648).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54772 + ... + 55340.

It is an arithmetic number, because the mean of its divisors is an integer number (1074336).

Almost surely, 2^31326864 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 31326864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42973440).

31326864 is an abundant number, since it is smaller than the sum of its proper divisors (54620016).

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

31326864 is a wasteful number, since it uses less digits than its factorization.

31326864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 642 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 31326864 is about 5597.0406466275. The cubic root of 31326864 is about 315.2382978880.

The spelling of 31326864 in words is "thirty-one million, three hundred twenty-six thousand, eight hundred sixty-four".