56647779 has 4 divisors (see below), whose sum is σ = 75530376. Its totient is φ = 37765184.

The previous prime is 56647771. The next prime is 56647783. The reversal of 56647779 is 97774665.

56647779 is nontrivially palindromic in base 16.

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

It is a cyclic number.

It is not a de Polignac number, because 56647779 - 2³ = 56647771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56647771) 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, 9441294 + ... + 9441299.

It is an arithmetic number, because the mean of its divisors is an integer number (18882594).

Almost surely, 2^56647779 is an apocalyptic number.

56647779 is a deficient number, since it is larger than the sum of its proper divisors (18882597).

56647779 is a wasteful number, since it uses less digits than its factorization.

56647779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18882596.

The product of its digits is 2222640, while the sum is 51.

The square root of 56647779 is about 7526.4718826287. The cubic root of 56647779 is about 384.0557712507.

The spelling of 56647779 in words is "fifty-six million, six hundred forty-seven thousand, seven hundred seventy-nine".