31992864 has 48 divisors (see below), whose sum is σ = 86260608. Its totient is φ = 10374912.

The previous prime is 31992859. The next prime is 31992869. The reversal of 31992864 is 46829913.

It is an interprime number because it is at equal distance from previous prime (31992859) and next prime (31992869).

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (31992869) 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, 952 + ... + 8055.

It is an arithmetic number, because the mean of its divisors is an integer number (1797096).

Almost surely, 2^31992864 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 31992864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43130304).

31992864 is an abundant number, since it is smaller than the sum of its proper divisors (54267744).

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

31992864 is a wasteful number, since it uses less digits than its factorization.

31992864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9057 (or 9049 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 31992864 is about 5656.2234750759. The cubic root of 31992864 is about 317.4566092769.

The spelling of 31992864 in words is "thirty-one million, nine hundred ninety-two thousand, eight hundred sixty-four".