28299564 has 48 divisors (see below), whose sum is σ = 73880800. Its totient is φ = 9367488.

The previous prime is 28299539. The next prime is 28299599. The reversal of 28299564 is 46599282.

28299564 is a `hidden beast` number, since 2 + 82 + 9 + 9 + 564 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16122 + ... + 17790.

Almost surely, 2^28299564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28299564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36940400).

28299564 is an abundant number, since it is smaller than the sum of its proper divisors (45581236).

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

28299564 is a wasteful number, since it uses less digits than its factorization.

28299564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839 (or 1831 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 28299564 is about 5319.7334519692. The cubic root of 28299564 is about 304.7379779563.

The spelling of 28299564 in words is "twenty-eight million, two hundred ninety-nine thousand, five hundred sixty-four".