28345764688 has 40 divisors (see below), whose sum is σ = 57831789600. Its totient is φ = 13421983104.

The previous prime is 28345764679. The next prime is 28345764701. The reversal of 28345764688 is 88646754382.

It is a happy number.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

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, 885018 + ... + 916486.

It is an arithmetic number, because the mean of its divisors is an integer number (1445794740).

Almost surely, 2^28345764688 is an apocalyptic number.

It is an amenable number.

28345764688 is an abundant number, since it is smaller than the sum of its proper divisors (29486024912).

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

28345764688 is a wasteful number, since it uses less digits than its factorization.

28345764688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34459 (or 34453 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 61.

The spelling of 28345764688 in words is "twenty-eight billion, three hundred forty-five million, seven hundred sixty-four thousand, six hundred eighty-eight".