28868864 has 36 divisors (see below), whose sum is σ = 60142656. Its totient is φ = 13804032.

The previous prime is 28868837. The next prime is 28868869. The reversal of 28868864 is 46886882.

It is a super-2 number, since 2×28868864² = 1666822617300992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28868869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3437 + ... + 8339.

Almost surely, 2^28868864 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 28868864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30071328).

28868864 is an abundant number, since it is smaller than the sum of its proper divisors (31273792).

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

28868864 is an equidigital number, since it uses as much as digits as its factorization.

28868864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4942 (or 4928 counting only the distinct ones).

The product of its digits is 1179648, while the sum is 50.

The square root of 28868864 is about 5372.9753396047. The cubic root of 28868864 is about 306.7678892907.

The spelling of 28868864 in words is "twenty-eight million, eight hundred sixty-eight thousand, eight hundred sixty-four".