31997448 has 48 divisors (see below), whose sum is σ = 99041280. Its totient is φ = 9141984.

The previous prime is 31997431. The next prime is 31997473. The reversal of 31997448 is 84479913.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31240 + ... + 32247.

It is an arithmetic number, because the mean of its divisors is an integer number (2063360).

Almost surely, 2^31997448 is an apocalyptic number.

It is an amenable number.

31997448 is an abundant number, since it is smaller than the sum of its proper divisors (67043832).

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

31997448 is a wasteful number, since it uses less digits than its factorization.

31997448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63506 (or 63499 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 31997448 is about 5656.6286779318. The cubic root of 31997448 is about 317.4717704870.

The spelling of 31997448 in words is "thirty-one million, nine hundred ninety-seven thousand, four hundred forty-eight".