31157448 has 64 divisors (see below), whose sum is σ = 89579520. Its totient is φ = 8846400.

The previous prime is 31157431. The next prime is 31157471. The reversal of 31157448 is 84475113.

It is a congruent number.

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, 31603 + ... + 32573.

It is an arithmetic number, because the mean of its divisors is an integer number (1399680).

Almost surely, 2^31157448 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 31157448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44789760).

31157448 is an abundant number, since it is smaller than the sum of its proper divisors (58422072).

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

31157448 is a wasteful number, since it uses less digits than its factorization.

31157448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178 (or 1174 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 31157448 is about 5581.8857028786. The cubic root of 31157448 is about 314.6689997513.

The spelling of 31157448 in words is "thirty-one million, one hundred fifty-seven thousand, four hundred forty-eight".