57281057 has 4 divisors (see below), whose sum is σ = 57360576. Its totient is φ = 57201540.

The previous prime is 57281051. The next prime is 57281089. The reversal of 57281057 is 75018275.

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 57281057 - 2²² = 53086753 is a prime.

It is a super-2 number, since 2×57281057² = 6562238982074498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57281051) 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, 38669 + ... + 40122.

It is an arithmetic number, because the mean of its divisors is an integer number (14340144).

Almost surely, 2^57281057 is an apocalyptic number.

It is an amenable number.

57281057 is a deficient number, since it is larger than the sum of its proper divisors (79519).

57281057 is an equidigital number, since it uses as much as digits as its factorization.

57281057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79518.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 57281057 is about 7568.4250012800. The cubic root of 57281057 is about 385.4816191106.

The spelling of 57281057 in words is "fifty-seven million, two hundred eighty-one thousand, fifty-seven".