56669939 has 4 divisors (see below), whose sum is σ = 57387360. Its totient is φ = 55952520.

The previous prime is 56669911. The next prime is 56669941. The reversal of 56669939 is 93996665.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56669939 is a prime.

It is a super-2 number, since 2×56669939² = 6422963972527442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56660939) 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, 358592 + ... + 358749.

It is an arithmetic number, because the mean of its divisors is an integer number (14346840).

Almost surely, 2^56669939 is an apocalyptic number.

56669939 is a deficient number, since it is larger than the sum of its proper divisors (717421).

56669939 is an equidigital number, since it uses as much as digits as its factorization.

56669939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717420.

The product of its digits is 2361960, while the sum is 53.

The square root of 56669939 is about 7527.9438759863. The cubic root of 56669939 is about 384.1058442133.

The spelling of 56669939 in words is "fifty-six million, six hundred sixty-nine thousand, nine hundred thirty-nine".