57242840 has 16 divisors (see below), whose sum is σ = 128796480. Its totient is φ = 22897120.

The previous prime is 57242821. The next prime is 57242849. The reversal of 57242840 is 4824275.

It is a junction number, because it is equal to n+sod(n) for n = 57242797 and 57242806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57242849) 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, 715496 + ... + 715575.

It is an arithmetic number, because the mean of its divisors is an integer number (8049780).

Almost surely, 2^57242840 is an apocalyptic number.

It is an amenable number.

57242840 is an abundant number, since it is smaller than the sum of its proper divisors (71553640).

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

57242840 is a wasteful number, since it uses less digits than its factorization.

57242840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431082 (or 1431078 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 57242840 is about 7565.8998142984. The cubic root of 57242840 is about 385.3958709922.

The spelling of 57242840 in words is "fifty-seven million, two hundred forty-two thousand, eight hundred forty".