57028761 has 24 divisors (see below), whose sum is σ = 90235080. Its totient is φ = 34546176.

The previous prime is 57028759. The next prime is 57028787. The reversal of 57028761 is 16782075.

57028761 is a `hidden beast` number, since 570 + 2 + 87 + 6 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9418761 + 47610000 = 3069^2 + 6900^2 .

It is not a de Polignac number, because 57028761 - 2¹ = 57028759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57028711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1990 + ... + 10863.

It is an arithmetic number, because the mean of its divisors is an integer number (3759795).

Almost surely, 2^57028761 is an apocalyptic number.

57028761 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

57028761 is a deficient number, since it is larger than the sum of its proper divisors (33206319).

57028761 is a wasteful number, since it uses less digits than its factorization.

57028761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12905 (or 12902 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 57028761 is about 7551.7389388140. The cubic root of 57028761 is about 384.9148313321.

The spelling of 57028761 in words is "fifty-seven million, twenty-eight thousand, seven hundred sixty-one".