28566566380 has 24 divisors (see below), whose sum is σ = 65443407120. Its totient is φ = 10387842240.

The previous prime is 28566566363. The next prime is 28566566383. The reversal of 28566566380 is 8366566582.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (28566566383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64923795 + ... + 64924234.

It is an arithmetic number, because the mean of its divisors is an integer number (2726808630).

Almost surely, 2^28566566380 is an apocalyptic number.

28566566380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28566566380 is an abundant number, since it is smaller than the sum of its proper divisors (36876840740).

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

28566566380 is a wasteful number, since it uses less digits than its factorization.

28566566380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129848049 (or 129848047 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 28566566380 in words is "twenty-eight billion, five hundred sixty-six million, five hundred sixty-six thousand, three hundred eighty".