6642856 has 64 divisors (see below), whose sum is σ = 14904000. Its totient is φ = 2741760.

The previous prime is 6642847. The next prime is 6642863. The reversal of 6642856 is 6582466.

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 15 ways as a sum of consecutive naturals, for example, 48420 + ... + 48556.

It is an arithmetic number, because the mean of its divisors is an integer number (232875).

Almost surely, 2^6642856 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 6642856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7452000).

6642856 is an abundant number, since it is smaller than the sum of its proper divisors (8261144).

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

6642856 is a wasteful number, since it uses less digits than its factorization.

6642856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 198 counting only the distinct ones).

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

The square root of 6642856 is about 2577.3738572431. The cubic root of 6642856 is about 187.9828715344.

The spelling of 6642856 in words is "six million, six hundred forty-two thousand, eight hundred fifty-six".