56647 has 4 divisors (see below), whose sum is σ = 58216. Its totient is φ = 55080.

The previous prime is 56633. The next prime is 56659. The reversal of 56647 is 74665.

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 56647 - 2⁷ = 56519 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 (56687) 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, 729 + ... + 802.

It is an arithmetic number, because the mean of its divisors is an integer number (14554).

2⁵⁶⁶⁴⁷ is an apocalyptic number.

56647 is a deficient number, since it is larger than the sum of its proper divisors (1569).

56647 is a wasteful number, since it uses less digits than its factorization.

56647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568.

The product of its digits is 5040, while the sum is 28.

The square root of 56647 is about 238.0063024376. The cubic root of 56647 is about 38.4054010777.

It can be divided in two parts, 5664 and 7, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 56647 in words is "fifty-six thousand, six hundred forty-seven".