28365457880 has 16 divisors (see below), whose sum is σ = 63822280320. Its totient is φ = 11346183136.

The previous prime is 28365457867. The next prime is 28365457909. The reversal of 28365457880 is 8875456382.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354568184 + ... + 354568263.

It is an arithmetic number, because the mean of its divisors is an integer number (3988892520).

Almost surely, 2^28365457880 is an apocalyptic number.

28365457880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28365457880 is an abundant number, since it is smaller than the sum of its proper divisors (35456822440).

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

28365457880 is a wasteful number, since it uses less digits than its factorization.

28365457880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709136458 (or 709136454 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 56.

The spelling of 28365457880 in words is "twenty-eight billion, three hundred sixty-five million, four hundred fifty-seven thousand, eight hundred eighty".