28727908664 has 32 divisors (see below), whose sum is σ = 66295175520. Its totient is φ = 11364886656.

The previous prime is 28727908633. The next prime is 28727908681. The reversal of 28727908664 is 46680972782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19729979 + ... + 19731434.

It is an arithmetic number, because the mean of its divisors is an integer number (2071724235).

Almost surely, 2^28727908664 is an apocalyptic number.

It is an amenable number.

28727908664 is an abundant number, since it is smaller than the sum of its proper divisors (37567266856).

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

28727908664 is a wasteful number, since it uses less digits than its factorization.

28727908664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39461439 (or 39461435 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 59.

The spelling of 28727908664 in words is "twenty-eight billion, seven hundred twenty-seven million, nine hundred eight thousand, six hundred sixty-four".