57261438 has 32 divisors (see below), whose sum is σ = 137037600. Its totient is φ = 17618688.

The previous prime is 57261437. The next prime is 57261469. The reversal of 57261438 is 83416275.

57261438 is a `hidden beast` number, since 5 + 7 + 2 + 614 + 38 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57261437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40083 + ... + 41486.

It is an arithmetic number, because the mean of its divisors is an integer number (4282425).

Almost surely, 2^57261438 is an apocalyptic number.

57261438 is an abundant number, since it is smaller than the sum of its proper divisors (79776162).

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

57261438 is a wasteful number, since it uses less digits than its factorization.

57261438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81593 (or 81587 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 57261438 is about 7567.1287817771. The cubic root of 57261438 is about 385.4376043998.

The spelling of 57261438 in words is "fifty-seven million, two hundred sixty-one thousand, four hundred thirty-eight".