57272240 has 20 divisors (see below), whose sum is σ = 133158144. Its totient is φ = 22908864.

The previous prime is 57272227. The next prime is 57272249. The reversal of 57272240 is 4227275.

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

It is not an unprimeable number, because it can be changed into a prime (57272249) 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, 357872 + ... + 358031.

Almost surely, 2^57272240 is an apocalyptic number.

It is an amenable number.

57272240 is an abundant number, since it is smaller than the sum of its proper divisors (75885904).

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

57272240 is a wasteful number, since it uses less digits than its factorization.

57272240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715916 (or 715910 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 57272240 is about 7567.8424930756. The cubic root of 57272240 is about 385.4618396464.

The spelling of 57272240 in words is "fifty-seven million, two hundred seventy-two thousand, two hundred forty".