28765344920 has 32 divisors (see below), whose sum is σ = 69700644720. Its totient is φ = 10621050240.

The previous prime is 28765344919. The next prime is 28765344941. The reversal of 28765344920 is 2944356782.

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, 27658466 + ... + 27659505.

Almost surely, 2^28765344920 is an apocalyptic number.

28765344920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28765344920 is an abundant number, since it is smaller than the sum of its proper divisors (40935299800).

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

28765344920 is a wasteful number, since it uses less digits than its factorization.

28765344920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55317995 (or 55317991 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 28765344920 in words is "twenty-eight billion, seven hundred sixty-five million, three hundred forty-four thousand, nine hundred twenty".