56641644 has 18 divisors (see below), whose sum is σ = 143177580. Its totient is φ = 18880536.

The previous prime is 56641643. The next prime is 56641661. The reversal of 56641644 is 44614665.

56641644 is a `hidden beast` number, since 5 + 6 + 6 + 4 + 1 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1573379 = 56641644 / (5 + 6 + 6 + 4 + 1 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 56641599 and 56641608.

It is not an unprimeable number, because it can be changed into a prime (56641643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 786654 + ... + 786725.

It is an arithmetic number, because the mean of its divisors is an integer number (7954310).

Almost surely, 2^56641644 is an apocalyptic number.

It is an amenable number.

56641644 is an abundant number, since it is smaller than the sum of its proper divisors (86535936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56641644 is a wasteful number, since it uses less digits than its factorization.

56641644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573389 (or 1573384 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 56641644 is about 7526.0643101159. The cubic root of 56641644 is about 384.0419062339.

The spelling of 56641644 in words is "fifty-six million, six hundred forty-one thousand, six hundred forty-four".