57281861 has 32 divisors (see below), whose sum is σ = 73543680. Its totient is φ = 43413696.

The previous prime is 57281843. The next prime is 57281899. The reversal of 57281861 is 16818275.

It is a cyclic number.

It is not a de Polignac number, because 57281861 - 2¹⁴ = 57265477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57281261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252230 + ... + 252456.

It is an arithmetic number, because the mean of its divisors is an integer number (2298240).

Almost surely, 2^57281861 is an apocalyptic number.

It is an amenable number.

57281861 is a deficient number, since it is larger than the sum of its proper divisors (16261819).

57281861 is a wasteful number, since it uses less digits than its factorization.

57281861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353.

The product of its digits is 26880, while the sum is 38.

The square root of 57281861 is about 7568.4781165040. The cubic root of 57281861 is about 385.4834226490.

The spelling of 57281861 in words is "fifty-seven million, two hundred eighty-one thousand, eight hundred sixty-one".