28866563424 has 72 divisors (see below), whose sum is σ = 82131220080. Its totient is φ = 9617273088.

The previous prime is 28866563399. The next prime is 28866563441. The reversal of 28866563424 is 42436566882.

It is a happy number.

28866563424 is a `hidden beast` number, since 28 + 86 + 65 + 63 + 424 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 562654 + ... + 611810.

It is an arithmetic number, because the mean of its divisors is an integer number (1140711390).

Almost surely, 2^28866563424 is an apocalyptic number.

28866563424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28866563424 is an abundant number, since it is smaller than the sum of its proper divisors (53264656656).

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

28866563424 is a wasteful number, since it uses less digits than its factorization.

28866563424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51212 (or 51201 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 54.

The spelling of 28866563424 in words is "twenty-eight billion, eight hundred sixty-six million, five hundred sixty-three thousand, four hundred twenty-four".