56828309 has 4 divisors (see below), whose sum is σ = 57275904. Its totient is φ = 56380716.

The previous prime is 56828281. The next prime is 56828339. The reversal of 56828309 is 90382865.

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 a cyclic number.

It is not a de Polignac number, because 56828309 - 2²⁰ = 55779733 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 (56828339) 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, 223607 + ... + 223860.

It is an arithmetic number, because the mean of its divisors is an integer number (14318976).

Almost surely, 2^56828309 is an apocalyptic number.

It is an amenable number.

56828309 is a deficient number, since it is larger than the sum of its proper divisors (447595).

56828309 is a wasteful number, since it uses less digits than its factorization.

56828309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447594.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 56828309 is about 7538.4553457588. The cubic root of 56828309 is about 384.4633192428.

The spelling of 56828309 in words is "fifty-six million, eight hundred twenty-eight thousand, three hundred nine".