57308905 has 4 divisors (see below), whose sum is σ = 68770692. Its totient is φ = 45847120.

The previous prime is 57308899. The next prime is 57308917. The reversal of 57308905 is 50980375.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34527376 + 22781529 = 5876^2 + 4773^2 .

It is not a de Polignac number, because 57308905 - 2⁵ = 57308873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5730886 + ... + 5730895.

It is an arithmetic number, because the mean of its divisors is an integer number (17192673).

Almost surely, 2^57308905 is an apocalyptic number.

It is an amenable number.

57308905 is a deficient number, since it is larger than the sum of its proper divisors (11461787).

57308905 is a wasteful number, since it uses less digits than its factorization.

57308905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11461786.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 57308905 is about 7570.2645264218. The cubic root of 57308905 is about 385.5440781125.

The spelling of 57308905 in words is "fifty-seven million, three hundred eight thousand, nine hundred five".