28149474808 has 32 divisors (see below), whose sum is σ = 64960328160. Its totient is φ = 11136055680.

The previous prime is 28149474781. The next prime is 28149474839. The reversal of 28149474808 is 80847494182.

It is a congruent number.

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, 19332703 + ... + 19334158.

It is an arithmetic number, because the mean of its divisors is an integer number (2030010255).

Almost surely, 2^28149474808 is an apocalyptic number.

28149474808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28149474808 is an abundant number, since it is smaller than the sum of its proper divisors (36810853352).

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

28149474808 is a wasteful number, since it uses less digits than its factorization.

28149474808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38666887 (or 38666883 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 55.

The spelling of 28149474808 in words is "twenty-eight billion, one hundred forty-nine million, four hundred seventy-four thousand, eight hundred eight".