28890716720 has 40 divisors (see below), whose sum is σ = 67180859376. Its totient is φ = 11554576128.

The previous prime is 28890716681. The next prime is 28890716731. The reversal of 28890716720 is 2761709882.

It is a tau number, because it is divible by the number of its divisors (40).

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, 611879 + ... + 657401.

Almost surely, 2^28890716720 is an apocalyptic number.

28890716720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28890716720 is an abundant number, since it is smaller than the sum of its proper divisors (38290142656).

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

28890716720 is a wasteful number, since it uses less digits than its factorization.

28890716720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53469 (or 53463 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 28890716720 in words is "twenty-eight billion, eight hundred ninety million, seven hundred sixteen thousand, seven hundred twenty".