28808777020 has 12 divisors (see below), whose sum is σ = 60498431784. Its totient is φ = 11523510800.

The previous prime is 28808777009. The next prime is 28808777047. The reversal of 28808777020 is 2077780882.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720219406 + ... + 720219445.

It is an arithmetic number, because the mean of its divisors is an integer number (5041535982).

Almost surely, 2^28808777020 is an apocalyptic number.

28808777020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28808777020 is an abundant number, since it is smaller than the sum of its proper divisors (31689654764).

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

28808777020 is a wasteful number, since it uses less digits than its factorization.

28808777020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440438860 (or 1440438858 counting only the distinct ones).

The product of its (nonzero) digits is 702464, while the sum is 49.

The spelling of 28808777020 in words is "twenty-eight billion, eight hundred eight million, seven hundred seventy-seven thousand, twenty".