28099415920 has 20 divisors (see below), whose sum is σ = 65331142200. Its totient is φ = 11239766336.

The previous prime is 28099415893. The next prime is 28099415921. The reversal of 28099415920 is 2951499082.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28099415921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175621270 + ... + 175621429.

It is an arithmetic number, because the mean of its divisors is an integer number (3266557110).

Almost surely, 2^28099415920 is an apocalyptic number.

28099415920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28099415920 is an abundant number, since it is smaller than the sum of its proper divisors (37231726280).

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

28099415920 is a wasteful number, since it uses less digits than its factorization.

28099415920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351242712 (or 351242706 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 28099415920 in words is "twenty-eight billion, ninety-nine million, four hundred fifteen thousand, nine hundred twenty".