6442644 has 24 divisors (see below), whose sum is σ = 16189600. Its totient is φ = 1982304.

The previous prime is 6442633. The next prime is 6442661. The reversal of 6442644 is 4462446.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20494 + ... + 20805.

Almost surely, 2^6442644 is an apocalyptic number.

It is an amenable number.

6442644 is an abundant number, since it is smaller than the sum of its proper divisors (9746956).

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

6442644 is a wasteful number, since it uses less digits than its factorization.

6442644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41319 (or 41317 counting only the distinct ones).

The product of its digits is 18432, while the sum is 30.

The square root of 6442644 is about 2538.2363956101. The cubic root of 6442644 is about 186.0750073247.

The spelling of 6442644 in words is "six million, four hundred forty-two thousand, six hundred forty-four".