6431644 has 12 divisors (see below), whose sum is σ = 11917584. Its totient is φ = 3026624.

The previous prime is 6431641. The next prime is 6431653. The reversal of 6431644 is 4461346.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6431641) 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, 47224 + ... + 47359.

It is an arithmetic number, because the mean of its divisors is an integer number (993132).

Almost surely, 2^6431644 is an apocalyptic number.

It is an amenable number.

6431644 is a deficient number, since it is larger than the sum of its proper divisors (5485940).

6431644 is a wasteful number, since it uses less digits than its factorization.

6431644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94604 (or 94602 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 6431644 is about 2536.0686110593. The cubic root of 6431644 is about 185.9690471482.

The spelling of 6431644 in words is "six million, four hundred thirty-one thousand, six hundred forty-four".