57731040 has 144 divisors (see below), whose sum is σ = 201434688. Its totient is φ = 15049728.

The previous prime is 57731039. The next prime is 57731041. The reversal of 57731040 is 4013775.

It is an interprime number because it is at equal distance from previous prime (57731039) and next prime (57731041).

It is a tau number, because it is divible by the number of its divisors (144).

It is a junction number, because it is equal to n+sod(n) for n = 57730995 and 57731013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57731041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67254 + ... + 68106.

It is an arithmetic number, because the mean of its divisors is an integer number (1398852).

Almost surely, 2^57731040 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 57731040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100717344).

57731040 is an abundant number, since it is smaller than the sum of its proper divisors (143703648).

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

57731040 is a wasteful number, since it uses less digits than its factorization.

57731040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 57731040 is about 7598.0944979646. The cubic root of 57731040 is about 386.4883971465.

The spelling of 57731040 in words is "fifty-seven million, seven hundred thirty-one thousand, forty".