28756821960 has 128 divisors (see below), whose sum is σ = 95895504000. Its totient is φ = 7665331968.

The previous prime is 28756821923. The next prime is 28756821983. The reversal of 28756821960 is 6912865782.

28756821960 is a `hidden beast` number, since 2 + 8 + 7 + 568 + 2 + 19 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 28756821897 and 28756821906.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3930786 + ... + 3938094.

It is an arithmetic number, because the mean of its divisors is an integer number (749183625).

Almost surely, 2^28756821960 is an apocalyptic number.

28756821960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28756821960 is an abundant number, since it is smaller than the sum of its proper divisors (67138682040).

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

28756821960 is a wasteful number, since it uses less digits than its factorization.

28756821960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10972 (or 10962 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 28756821960 in words is "twenty-eight billion, seven hundred fifty-six million, eight hundred twenty-one thousand, nine hundred sixty".