6636994728 has 384 divisors, whose sum is σ = 22250793600. Its totient is φ = 1630347264.

The previous prime is 6636994669. The next prime is 6636994753. The reversal of 6636994728 is 8274996366.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21204300 + ... + 21204612.

It is an arithmetic number, because the mean of its divisors is an integer number (57944775).

Almost surely, 2^6636994728 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 6636994728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11125396800).

6636994728 is an abundant number, since it is smaller than the sum of its proper divisors (15613798872).

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

6636994728 is a wasteful number, since it uses less digits than its factorization.

6636994728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 430 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 60.

The square root of 6636994728 is about 81467.7526877967. The cubic root of 6636994728 is about 1879.2756686020.

The spelling of 6636994728 in words is "six billion, six hundred thirty-six million, nine hundred ninety-four thousand, seven hundred twenty-eight".