28928306680992 has 72 divisors (see below), whose sum is σ = 82444883160276. Its totient is φ = 9621668699136.

The previous prime is 28928306680969. The next prime is 28928306681033. The reversal of 28928306680992 is 29908660382982.

28928306680992 is a `hidden beast` number, since 289 + 283 + 0 + 6 + 68 + 0 + 9 + 9 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 28208463034896 + 719843646096 = 5311164^2 + 848436^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 28928306680992.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109765003 + ... + 110028234.

Almost surely, 2^{28928306680992} is an apocalyptic number.

It is an amenable number.

28928306680992 is an abundant number, since it is smaller than the sum of its proper divisors (53516576479284).

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

28928306680992 is a wasteful number, since it uses less digits than its factorization.

28928306680992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219793710 (or 219793699 counting only the distinct ones).

The product of its (nonzero) digits is 322486272, while the sum is 72.

The spelling of 28928306680992 in words is "twenty-eight trillion, nine hundred twenty-eight billion, three hundred six million, six hundred eighty thousand, nine hundred ninety-two".