56905009 has 16 divisors (see below), whose sum is σ = 67067136. Its totient is φ = 47275200.

The previous prime is 56904997. The next prime is 56905073. The reversal of 56905009 is 90050965.

It is not a de Polignac number, because 56905009 - 2¹³ = 56896817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56905099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29379 + ... + 31255.

It is an arithmetic number, because the mean of its divisors is an integer number (4191696).

Almost surely, 2^56905009 is an apocalyptic number.

It is an amenable number.

56905009 is a deficient number, since it is larger than the sum of its proper divisors (10162127).

56905009 is a wasteful number, since it uses less digits than its factorization.

56905009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 56905009 is about 7543.5408794544. The cubic root of 56905009 is about 384.6362088961.

The spelling of 56905009 in words is "fifty-six million, nine hundred five thousand, nine".