57728339 has 4 divisors (see below), whose sum is σ = 58590024. Its totient is φ = 56866656.

The previous prime is 57728329. The next prime is 57728347. The reversal of 57728339 is 93382775.

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-57728339 is a prime.

It is a super-2 number, since 2×57728339² = 6665122247397842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57728339.

It is not an unprimeable number, because it can be changed into a prime (57728309) 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, 430742 + ... + 430875.

It is an arithmetic number, because the mean of its divisors is an integer number (14647506).

Almost surely, 2^57728339 is an apocalyptic number.

57728339 is a deficient number, since it is larger than the sum of its proper divisors (861685).

57728339 is an equidigital number, since it uses as much as digits as its factorization.

57728339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861684.

The product of its digits is 317520, while the sum is 44.

The square root of 57728339 is about 7597.9167539530. The cubic root of 57728339 is about 386.4823696470.

The spelling of 57728339 in words is "fifty-seven million, seven hundred twenty-eight thousand, three hundred thirty-nine".