28055866620 has 96 divisors (see below), whose sum is σ = 79819407360. Its totient is φ = 7361763840.

The previous prime is 28055866607. The next prime is 28055866639. The reversal of 28055866620 is 2666855082.

It is a self number, because there is not a number n which added to its sum of digits gives 28055866620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1915525 + ... + 1930115.

It is an arithmetic number, because the mean of its divisors is an integer number (831452160).

Almost surely, 2^28055866620 is an apocalyptic number.

28055866620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28055866620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39909703680).

28055866620 is an abundant number, since it is smaller than the sum of its proper divisors (51763540740).

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

28055866620 is a wasteful number, since it uses less digits than its factorization.

28055866620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15115 (or 15113 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 28055866620 in words is "twenty-eight billion, fifty-five million, eight hundred sixty-six thousand, six hundred twenty".