57287239 has 4 divisors (see below), whose sum is σ = 57812920. Its totient is φ = 56761560.

The previous prime is 57287231. The next prime is 57287249. The reversal of 57287239 is 93278275.

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 57287239 - 2³ = 57287231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 57287195 and 57287204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57287231) 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, 262677 + ... + 262894.

It is an arithmetic number, because the mean of its divisors is an integer number (14453230).

Almost surely, 2^57287239 is an apocalyptic number.

57287239 is a deficient number, since it is larger than the sum of its proper divisors (525681).

57287239 is a wasteful number, since it uses less digits than its factorization.

57287239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525680.

The product of its digits is 211680, while the sum is 43.

The square root of 57287239 is about 7568.8333975587. The cubic root of 57287239 is about 385.4954861827.

It can be divided in two parts, 57 and 287239, that added together give a square (287296 = 536²).

The spelling of 57287239 in words is "fifty-seven million, two hundred eighty-seven thousand, two hundred thirty-nine".