28515865180 has 48 divisors (see below), whose sum is σ = 65961552384. Its totient is φ = 10268723520.

The previous prime is 28515865159. The next prime is 28515865181. The reversal of 28515865180 is 8156851582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28515865181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 606552 + ... + 651871.

It is an arithmetic number, because the mean of its divisors is an integer number (1374199008).

Almost surely, 2^28515865180 is an apocalyptic number.

28515865180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28515865180 is an abundant number, since it is smaller than the sum of its proper divisors (37445687204).

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

28515865180 is a wasteful number, since it uses less digits than its factorization.

28515865180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258546 (or 1258544 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 49.

The spelling of 28515865180 in words is "twenty-eight billion, five hundred fifteen million, eight hundred sixty-five thousand, one hundred eighty".