57717640 has 16 divisors (see below), whose sum is σ = 129864780. Its totient is φ = 23087040.

The previous prime is 57717623. The next prime is 57717641. The reversal of 57717640 is 4671775.

It can be written as a sum of positive squares in 2 ways, for example, as 56761156 + 956484 = 7534^2 + 978^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 57717640.

It is not an unprimeable number, because it can be changed into a prime (57717641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721431 + ... + 721510.

Almost surely, 2^57717640 is an apocalyptic number.

It is an amenable number.

57717640 is an abundant number, since it is smaller than the sum of its proper divisors (72147140).

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

57717640 is a wasteful number, since it uses less digits than its factorization.

57717640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442952 (or 1442948 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 37.

The square root of 57717640 is about 7597.2126467541. The cubic root of 57717640 is about 386.4584921175.

The spelling of 57717640 in words is "fifty-seven million, seven hundred seventeen thousand, six hundred forty".