57428879 has 4 divisors (see below), whose sum is σ = 57625176. Its totient is φ = 57232584.

The previous prime is 57428869. The next prime is 57428897. The reversal of 57428879 is 97882475.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57428879 is a prime.

It is a super-2 number, since 2×57428879² = 6596152286393282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57428809) 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, 97709 + ... + 98294.

It is an arithmetic number, because the mean of its divisors is an integer number (14406294).

Almost surely, 2^57428879 is an apocalyptic number.

57428879 is a deficient number, since it is larger than the sum of its proper divisors (196297).

57428879 is a wasteful number, since it uses less digits than its factorization.

57428879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196296.

The product of its digits is 1128960, while the sum is 50.

The square root of 57428879 is about 7578.1844131692. The cubic root of 57428879 is about 385.8129311808.

The spelling of 57428879 in words is "fifty-seven million, four hundred twenty-eight thousand, eight hundred seventy-nine".