28745728860 has 24 divisors (see below), whose sum is σ = 80488040976. Its totient is φ = 7665527680.

The previous prime is 28745728801. The next prime is 28745728873. The reversal of 28745728860 is 6882754782.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28745728860.

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, 239547681 + ... + 239547800.

It is an arithmetic number, because the mean of its divisors is an integer number (3353668374).

Almost surely, 2^28745728860 is an apocalyptic number.

28745728860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28745728860 is an abundant number, since it is smaller than the sum of its proper divisors (51742312116).

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

28745728860 is a wasteful number, since it uses less digits than its factorization.

28745728860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479095493 (or 479095491 counting only the distinct ones).

The product of its (nonzero) digits is 12042240, while the sum is 57.

The spelling of 28745728860 in words is "twenty-eight billion, seven hundred forty-five million, seven hundred twenty-eight thousand, eight hundred sixty".