28561568 has 24 divisors (see below), whose sum is σ = 64264032. Its totient is φ = 12240576.

The previous prime is 28561531. The next prime is 28561609. The reversal of 28561568 is 86516582.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63530 + ... + 63977.

It is an arithmetic number, because the mean of its divisors is an integer number (2677668).

Almost surely, 2^28561568 is an apocalyptic number.

28561568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28561568 is an abundant number, since it is smaller than the sum of its proper divisors (35702464).

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

28561568 is a wasteful number, since it uses less digits than its factorization.

28561568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127524 (or 127516 counting only the distinct ones).

The product of its digits is 115200, while the sum is 41.

The square root of 28561568 is about 5344.3023866544. The cubic root of 28561568 is about 305.6755357263.

The spelling of 28561568 in words is "twenty-eight million, five hundred sixty-one thousand, five hundred sixty-eight".