57123879 has 4 divisors (see below), whose sum is σ = 76165176. Its totient is φ = 38082584.

The previous prime is 57123851. The next prime is 57123889. The reversal of 57123879 is 97832175.

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

It is a cyclic number.

It is not a de Polignac number, because 57123879 - 2⁷ = 57123751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57123879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57123889) 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, 9520644 + ... + 9520649.

It is an arithmetic number, because the mean of its divisors is an integer number (19041294).

Almost surely, 2^57123879 is an apocalyptic number.

57123879 is a deficient number, since it is larger than the sum of its proper divisors (19041297).

57123879 is a wasteful number, since it uses less digits than its factorization.

57123879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19041296.

The product of its digits is 105840, while the sum is 42.

The square root of 57123879 is about 7558.0340697830. The cubic root of 57123879 is about 385.1287116733.

It can be divided in two parts, 5712 and 3879, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 57123879 in words is "fifty-seven million, one hundred twenty-three thousand, eight hundred seventy-nine".