6408644 has 18 divisors (see below), whose sum is σ = 12328302. Its totient is φ = 2912800.

The previous prime is 6408637. The next prime is 6408653. The reversal of 6408644 is 4468046.

It can be written as a sum of positive squares in only one way, i.e., 6400900 + 7744 = 2530^2 + 88^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6408644.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6137 + ... + 7104.

Almost surely, 2^6408644 is an apocalyptic number.

It is an amenable number.

6408644 is a deficient number, since it is larger than the sum of its proper divisors (5919658).

6408644 is a wasteful number, since it uses less digits than its factorization.

6408644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13267 (or 13254 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 6408644 is about 2531.5299721710. The cubic root of 6408644 is about 185.7471030199.

The spelling of 6408644 in words is "six million, four hundred eight thousand, six hundred forty-four".