5661644 has 6 divisors (see below), whose sum is σ = 9907884. Its totient is φ = 2830820.

The previous prime is 5661637. The next prime is 5661647. The reversal of 5661644 is 4461665.

It is a self number, because there is not a number n which added to its sum of digits gives 5661644.

It is not an unprimeable number, because it can be changed into a prime (5661647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 707702 + ... + 707709.

It is an arithmetic number, because the mean of its divisors is an integer number (1651314).

Almost surely, 2^5661644 is an apocalyptic number.

It is an amenable number.

5661644 is a deficient number, since it is larger than the sum of its proper divisors (4246240).

5661644 is a wasteful number, since it uses less digits than its factorization.

5661644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415415 (or 1415413 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 5661644 is about 2379.4209379595. The cubic root of 5661644 is about 178.2300186702.

The spelling of 5661644 in words is "five million, six hundred sixty-one thousand, six hundred forty-four".