57385840 has 20 divisors (see below), whose sum is σ = 133422264. Its totient is φ = 22954304.

The previous prime is 57385831. The next prime is 57385841. The reversal of 57385840 is 4858375.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 57385793 and 57385802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57385841) 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, 358582 + ... + 358741.

Almost surely, 2^57385840 is an apocalyptic number.

It is an amenable number.

57385840 is an abundant number, since it is smaller than the sum of its proper divisors (76036424).

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

57385840 is a wasteful number, since it uses less digits than its factorization.

57385840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717336 (or 717330 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 57385840 is about 7575.3442166016. The cubic root of 57385840 is about 385.7165269972.

The spelling of 57385840 in words is "fifty-seven million, three hundred eighty-five thousand, eight hundred forty".