57147840 has 84 divisors (see below), whose sum is σ = 196574664. Its totient is φ = 15238656.

The previous prime is 57147823. The next prime is 57147859. The reversal of 57147840 is 4874175.

57147840 is a `hidden beast` number, since 571 + 4 + 7 + 84 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 57147795 and 57147804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7042 + ... + 12801.

Almost surely, 2^57147840 is an apocalyptic number.

It is an amenable number.

57147840 is an abundant number, since it is smaller than the sum of its proper divisors (139426824).

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

57147840 is a wasteful number, since it uses less digits than its factorization.

57147840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19866 (or 19853 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 57147840 is about 7559.6190380204. The cubic root of 57147840 is about 385.1825524329.

The spelling of 57147840 in words is "fifty-seven million, one hundred forty-seven thousand, eight hundred forty".