31791648 has 48 divisors (see below), whose sum is σ = 95376960. Its totient is φ = 9083136.

The previous prime is 31791637. The next prime is 31791689. The reversal of 31791648 is 84619713.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22983 + ... + 24326.

It is an arithmetic number, because the mean of its divisors is an integer number (1987020).

Almost surely, 2^31791648 is an apocalyptic number.

It is an amenable number.

31791648 is an abundant number, since it is smaller than the sum of its proper divisors (63585312).

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

31791648 is a wasteful number, since it uses less digits than its factorization.

31791648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47329 (or 47321 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 31791648 is about 5638.4082860325. The cubic root of 31791648 is about 316.7896716355.

The spelling of 31791648 in words is "thirty-one million, seven hundred ninety-one thousand, six hundred forty-eight".