56715309 has 40 divisors (see below), whose sum is σ = 101059200. Its totient is φ = 30992544.

The previous prime is 56715293. The next prime is 56715319. The reversal of 56715309 is 90351765.

It is a happy number.

56715309 is a `hidden beast` number, since 56 + 71 + 530 + 9 = 666.

It is not a de Polignac number, because 56715309 - 2⁴ = 56715293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56715319) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10867 + ... + 15215.

It is an arithmetic number, because the mean of its divisors is an integer number (2526480).

Almost surely, 2^56715309 is an apocalyptic number.

It is an amenable number.

56715309 is a deficient number, since it is larger than the sum of its proper divisors (44343891).

56715309 is a wasteful number, since it uses less digits than its factorization.

56715309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4391 (or 4382 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 36.

The square root of 56715309 is about 7530.9567121316. The cubic root of 56715309 is about 384.2083220224.

It can be divided in two parts, 567 and 15309, that added together give a square (15876 = 126²).

The spelling of 56715309 in words is "fifty-six million, seven hundred fifteen thousand, three hundred nine".