56645 has 4 divisors (see below), whose sum is σ = 67980. Its totient is φ = 45312.

The previous prime is 56633. The next prime is 56659. The reversal of 56645 is 54665.

It is a Cunningham number, because it is equal to 238²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20164 + 36481 = 142^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 56645 - 2⁴ = 56629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5660 + ... + 5669.

It is an arithmetic number, because the mean of its divisors is an integer number (16995).

2⁵⁶⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

56645 is a deficient number, since it is larger than the sum of its proper divisors (11335).

56645 is a wasteful number, since it uses less digits than its factorization.

56645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11334.

The product of its digits is 3600, while the sum is 26.

The square root of 56645 is about 238.0021008311. The cubic root of 56645 is about 38.4049490872.

The spelling of 56645 in words is "fifty-six thousand, six hundred forty-five".