6428656 has 40 divisors (see below), whose sum is σ = 13860224. Its totient is φ = 2868480.

The previous prime is 6428651. The next prime is 6428671. The reversal of 6428656 is 6568246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6428651) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5950 + ... + 6946.

Almost surely, 2^6428656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6428656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6930112).

6428656 is an abundant number, since it is smaller than the sum of its proper divisors (7431568).

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

6428656 is a wasteful number, since it uses less digits than its factorization.

6428656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049 (or 1043 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 6428656 is about 2535.4794418413. The cubic root of 6428656 is about 185.9402436476.

Subtracting from 6428656 its product of digits (69120), we obtain a palindrome (6359536).

The spelling of 6428656 in words is "six million, four hundred twenty-eight thousand, six hundred fifty-six".