56507709 has 4 divisors (see below), whose sum is σ = 75343616. Its totient is φ = 37671804.

The previous prime is 56507707. The next prime is 56507713. The reversal of 56507709 is 90770565.

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 56507709 - 2¹ = 56507707 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 (56507701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9417949 + ... + 9417954.

It is an arithmetic number, because the mean of its divisors is an integer number (18835904).

Almost surely, 2^56507709 is an apocalyptic number.

It is an amenable number.

56507709 is a deficient number, since it is larger than the sum of its proper divisors (18835907).

56507709 is a wasteful number, since it uses less digits than its factorization.

56507709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18835906.

The product of its (nonzero) digits is 66150, while the sum is 39.

The square root of 56507709 is about 7517.1609667480. The cubic root of 56507709 is about 383.7389651182.

The spelling of 56507709 in words is "fifty-six million, five hundred seven thousand, seven hundred nine".