56670209 has 4 divisors (see below), whose sum is σ = 56687316. Its totient is φ = 56653104.

The previous prime is 56670193. The next prime is 56670221. The reversal of 56670209 is 90207665.

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 45427600 + 11242609 = 6740^2 + 3353^2 .

It is a cyclic number.

It is not a de Polignac number, because 56670209 - 2⁴ = 56670193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56570209) 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, 1814 + ... + 10799.

It is an arithmetic number, because the mean of its divisors is an integer number (14171829).

Almost surely, 2^56670209 is an apocalyptic number.

It is an amenable number.

56670209 is a deficient number, since it is larger than the sum of its proper divisors (17107).

56670209 is a wasteful number, since it uses less digits than its factorization.

56670209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17106.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 56670209 is about 7527.9618091486. The cubic root of 56670209 is about 384.1064542276.

The spelling of 56670209 in words is "fifty-six million, six hundred seventy thousand, two hundred nine".