6645428888 has 32 divisors (see below), whose sum is σ = 14543193600. Its totient is φ = 2787443232.

The previous prime is 6645428857. The next prime is 6645428891. The reversal of 6645428888 is 8888245466.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1259798 + ... + 1265061.

It is an arithmetic number, because the mean of its divisors is an integer number (454474800).

Almost surely, 2^6645428888 is an apocalyptic number.

It is an amenable number.

6645428888 is an abundant number, since it is smaller than the sum of its proper divisors (7897764712).

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

6645428888 is a wasteful number, since it uses less digits than its factorization.

6645428888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524919 (or 2524915 counting only the distinct ones).

The product of its digits is 23592960, while the sum is 59.

The square root of 6645428888 is about 81519.5000475346. The cubic root of 6645428888 is about 1880.0713802685.

The spelling of 6645428888 in words is "six billion, six hundred forty-five million, four hundred twenty-eight thousand, eight hundred eighty-eight".