28731445860 has 48 divisors (see below), whose sum is σ = 86636362176. Its totient is φ = 7072355712.

The previous prime is 28731445843. The next prime is 28731445903. The reversal of 28731445860 is 6854413782.

It is a super-2 number, since 2×28731445860² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18416814 + ... + 18418373.

It is an arithmetic number, because the mean of its divisors is an integer number (1804924212).

Almost surely, 2^28731445860 is an apocalyptic number.

28731445860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28731445860 is an abundant number, since it is smaller than the sum of its proper divisors (57904916316).

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

28731445860 is a wasteful number, since it uses less digits than its factorization.

28731445860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36835212 (or 36835210 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 48.

The spelling of 28731445860 in words is "twenty-eight billion, seven hundred thirty-one million, four hundred forty-five thousand, eight hundred sixty".