56809947 has 4 divisors (see below), whose sum is σ = 75746600. Its totient is φ = 37873296.

The previous prime is 56809939. The next prime is 56809997. The reversal of 56809947 is 74990865.

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

It is not a de Polignac number, because 56809947 - 2³ = 56809939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56809896 and 56809905.

It is not an unprimeable number, because it can be changed into a prime (56809997) 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, 9468322 + ... + 9468327.

It is an arithmetic number, because the mean of its divisors is an integer number (18936650).

Almost surely, 2^56809947 is an apocalyptic number.

56809947 is a deficient number, since it is larger than the sum of its proper divisors (18936653).

56809947 is a wasteful number, since it uses less digits than its factorization.

56809947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18936652.

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 56809947 is about 7537.2373586083. The cubic root of 56809947 is about 384.4219063386.

The spelling of 56809947 in words is "fifty-six million, eight hundred nine thousand, nine hundred forty-seven".