28427790920 has 32 divisors (see below), whose sum is σ = 63969333120. Its totient is φ = 11369906880.

The previous prime is 28427790917. The next prime is 28427790947. The reversal of 28427790920 is 2909772482.

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, 407825 + ... + 472415.

It is an arithmetic number, because the mean of its divisors is an integer number (1999041660).

Almost surely, 2^28427790920 is an apocalyptic number.

28427790920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28427790920 is an abundant number, since it is smaller than the sum of its proper divisors (35541542200).

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

28427790920 is a wasteful number, since it uses less digits than its factorization.

28427790920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75605 (or 75601 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 28427790920 in words is "twenty-eight billion, four hundred twenty-seven million, seven hundred ninety thousand, nine hundred twenty".