57297640 has 16 divisors (see below), whose sum is σ = 128919780. Its totient is φ = 22919040.

The previous prime is 57297619. The next prime is 57297659. The reversal of 57297640 is 4679275.

57297640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 52794756 + 4502884 = 7266^2 + 2122^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 1432441 = 57297640 / (5 + 7 + 2 + 9 + 7 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 57297593 and 57297602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 716181 + ... + 716260.

Almost surely, 2^57297640 is an apocalyptic number.

It is an amenable number.

57297640 is an abundant number, since it is smaller than the sum of its proper divisors (71622140).

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

57297640 is a wasteful number, since it uses less digits than its factorization.

57297640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432452 (or 1432448 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 57297640 is about 7569.5204603726. The cubic root of 57297640 is about 385.5188147982.

The spelling of 57297640 in words is "fifty-seven million, two hundred ninety-seven thousand, six hundred forty".