57028661 has 4 divisors (see below), whose sum is σ = 59508192. Its totient is φ = 54549132.

The previous prime is 57028649. The next prime is 57028667. The reversal of 57028661 is 16682075.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57028661 - 2¹⁸ = 56766517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57028667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1239731 + ... + 1239776.

It is an arithmetic number, because the mean of its divisors is an integer number (14877048).

Almost surely, 2^57028661 is an apocalyptic number.

It is an amenable number.

57028661 is a deficient number, since it is larger than the sum of its proper divisors (2479531).

57028661 is a wasteful number, since it uses less digits than its factorization.

57028661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479530.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 57028661 is about 7551.7323178195. The cubic root of 57028661 is about 384.9146063491.

The spelling of 57028661 in words is "fifty-seven million, twenty-eight thousand, six hundred sixty-one".