57665240 has 64 divisors (see below), whose sum is σ = 136252800. Its totient is φ = 21938688.

The previous prime is 57665233. The next prime is 57665263. The reversal of 57665240 is 4256675.

It is a self number, because there is not a number n which added to its sum of digits gives 57665240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69146 + ... + 69974.

It is an arithmetic number, because the mean of its divisors is an integer number (2128950).

Almost surely, 2^57665240 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 57665240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68126400).

57665240 is an abundant number, since it is smaller than the sum of its proper divisors (78587560).

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

57665240 is a wasteful number, since it uses less digits than its factorization.

57665240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 57665240 is about 7593.7632304411. The cubic root of 57665240 is about 386.3415056046.

The spelling of 57665240 in words is "fifty-seven million, six hundred sixty-five thousand, two hundred forty".