57236809 has 4 divisors (see below), whose sum is σ = 65413504. Its totient is φ = 49060116.

The previous prime is 57236789. The next prime is 57236831. The reversal of 57236809 is 90863275.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 57236809 - 2¹³ = 57228617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57236869) 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, 4088337 + ... + 4088350.

It is an arithmetic number, because the mean of its divisors is an integer number (16353376).

Almost surely, 2^57236809 is an apocalyptic number.

It is an amenable number.

57236809 is a deficient number, since it is larger than the sum of its proper divisors (8176695).

57236809 is an equidigital number, since it uses as much as digits as its factorization.

57236809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8176694.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 57236809 is about 7565.5012391777. The cubic root of 57236809 is about 385.3823356509.

The spelling of 57236809 in words is "fifty-seven million, two hundred thirty-six thousand, eight hundred nine".