57135240 has 64 divisors (see below), whose sum is σ = 190454400. Its totient is φ = 15235776.

The previous prime is 57135227. The next prime is 57135311. The reversal of 57135240 is 4253175.

It is a happy number.

57135240 is a `hidden beast` number, since 571 + 3 + 52 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25372 + ... + 27531.

It is an arithmetic number, because the mean of its divisors is an integer number (2975850).

Almost surely, 2^57135240 is an apocalyptic number.

It is an amenable number.

57135240 is an abundant number, since it is smaller than the sum of its proper divisors (133319160).

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

57135240 is a wasteful number, since it uses less digits than its factorization.

57135240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52923 (or 52913 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 57135240 is about 7558.7856167509. The cubic root of 57135240 is about 385.1542419030.

It can be divided in two parts, 57135 and 240, that added together give a palindrome (57375).

The spelling of 57135240 in words is "fifty-seven million, one hundred thirty-five thousand, two hundred forty".