28998864 has 80 divisors (see below), whose sum is σ = 87643200. Its totient is φ = 9154944.

The previous prime is 28998847. The next prime is 28998911. The reversal of 28998864 is 46889982.

It is a super-2 number, since 2×28998864² = 1681868226580992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 28998864.

It is a congruent number.

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, 6442 + ... + 9974.

It is an arithmetic number, because the mean of its divisors is an integer number (1095540).

Almost surely, 2^28998864 is an apocalyptic number.

28998864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28998864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43821600).

28998864 is an abundant number, since it is smaller than the sum of its proper divisors (58644336).

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

28998864 is a wasteful number, since it uses less digits than its factorization.

28998864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3569 (or 3557 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 28998864 is about 5385.0593311495. The cubic root of 28998864 is about 307.2276708473.

The spelling of 28998864 in words is "twenty-eight million, nine hundred ninety-eight thousand, eight hundred sixty-four".