57309623 has 4 divisors (see below), whose sum is σ = 65496720. Its totient is φ = 49122528.

The previous prime is 57309611. The next prime is 57309631. The reversal of 57309623 is 32690375.

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

It is a de Polignac number, because none of the positive numbers 2^k-57309623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57309323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4093538 + ... + 4093551.

It is an arithmetic number, because the mean of its divisors is an integer number (16374180).

Almost surely, 2^57309623 is an apocalyptic number.

57309623 is a deficient number, since it is larger than the sum of its proper divisors (8187097).

57309623 is an equidigital number, since it uses as much as digits as its factorization.

57309623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8187096.

The product of its (nonzero) digits is 34020, while the sum is 35.

The square root of 57309623 is about 7570.3119486584. The cubic root of 57309623 is about 385.5456882142.

Adding to 57309623 its reverse (32690375), we get a palindrome (89999998).

The spelling of 57309623 in words is "fifty-seven million, three hundred nine thousand, six hundred twenty-three".