28563476680 has 32 divisors (see below), whose sum is σ = 64346176440. Its totient is φ = 11411461120.

The previous prime is 28563476651. The next prime is 28563476681. The reversal of 28563476680 is 8667436582.

It can be written as a sum of positive squares in 4 ways, for example, as 16441907076 + 12121569604 = 128226^2 + 110098^2 .

It is not an unprimeable number, because it can be changed into a prime (28563476681) 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, 402049 + ... + 467728.

Almost surely, 2^28563476680 is an apocalyptic number.

28563476680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28563476680 is an abundant number, since it is smaller than the sum of its proper divisors (35782699760).

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

28563476680 is a wasteful number, since it uses less digits than its factorization.

28563476680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870609 (or 870605 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 55.

The spelling of 28563476680 in words is "twenty-eight billion, five hundred sixty-three million, four hundred seventy-six thousand, six hundred eighty".