6645980928 has 72 divisors (see below), whose sum is σ = 18099440128. Its totient is φ = 2163796992.

The previous prime is 6645980921. The next prime is 6645980941. The reversal of 6645980928 is 8290895466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645980921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67600 + ... + 133647.

Almost surely, 2^6645980928 is an apocalyptic number.

It is an amenable number.

6645980928 is an abundant number, since it is smaller than the sum of its proper divisors (11453459200).

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

6645980928 is a wasteful number, since it uses less digits than its factorization.

6645980928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201309 (or 201295 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 57.

The square root of 6645980928 is about 81522.8859155513. The cubic root of 6645980928 is about 1880.1234384017.

The spelling of 6645980928 in words is "six billion, six hundred forty-five million, nine hundred eighty thousand, nine hundred twenty-eight".