57238281 has 12 divisors (see below), whose sum is σ = 82771780. Its totient is φ = 38115360.

The previous prime is 57238273. The next prime is 57238343. The reversal of 57238281 is 18283275.

57238281 is a `hidden beast` number, since 572 + 3 + 8 + 2 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31136400 + 26101881 = 5580^2 + 5109^2 .

It is not a de Polignac number, because 57238281 - 2³ = 57238273 is a prime.

It is a super-2 number, since 2×57238281² = 6552441623669922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57238271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6075 + ... + 12303.

Almost surely, 2^57238281 is an apocalyptic number.

It is an amenable number.

57238281 is a deficient number, since it is larger than the sum of its proper divisors (25533499).

57238281 is a wasteful number, since it uses less digits than its factorization.

57238281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7256 (or 7253 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 57238281 is about 7565.5985222585. The cubic root of 57238281 is about 385.3856393404.

The spelling of 57238281 in words is "fifty-seven million, two hundred thirty-eight thousand, two hundred eighty-one".