6407656 has 16 divisors (see below), whose sum is σ = 12053700. Its totient is φ = 3193344.

The previous prime is 6407591. The next prime is 6407671. The reversal of 6407656 is 6567046.

It can be written as a sum of positive squares in 2 ways, for example, as 5712100 + 695556 = 2390^2 + 834^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1690 + ... + 3958.

Almost surely, 2^6407656 is an apocalyptic number.

It is an amenable number.

6407656 is a deficient number, since it is larger than the sum of its proper divisors (5646044).

6407656 is a wasteful number, since it uses less digits than its factorization.

6407656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628 (or 2624 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 6407656 is about 2531.3348257392. The cubic root of 6407656 is about 185.7375571852.

The spelling of 6407656 in words is "six million, four hundred seven thousand, six hundred fifty-six".