28986568 has 16 divisors (see below), whose sum is σ = 58530780. Its totient is φ = 13378368.

The previous prime is 28986563. The next prime is 28986583. The reversal of 28986568 is 86568982.

It can be written as a sum of positive squares in 2 ways, for example, as 28068804 + 917764 = 5298^2 + 958^2 .

It is a super-2 number, since 2×28986568² = 1680442248837248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (28986563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139255 + ... + 139462.

Almost surely, 2^28986568 is an apocalyptic number.

It is an amenable number.

28986568 is an abundant number, since it is smaller than the sum of its proper divisors (29544212).

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

28986568 is a wasteful number, since it uses less digits than its factorization.

28986568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278736 (or 278732 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 52.

The square root of 28986568 is about 5383.9175328008. The cubic root of 28986568 is about 307.1842414967.

The spelling of 28986568 in words is "twenty-eight million, nine hundred eighty-six thousand, five hundred sixty-eight".