28864512 has 156 divisors (see below), whose sum is σ = 89445720. Its totient is φ = 9289728.

The previous prime is 28864499. The next prime is 28864519. The reversal of 28864512 is 21546882.

28864512 is a `hidden beast` number, since 2 + 8 + 8 + 645 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28864519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 995314 + ... + 995342.

It is an arithmetic number, because the mean of its divisors is an integer number (573370).

Almost surely, 2^28864512 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 28864512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44722860).

28864512 is an abundant number, since it is smaller than the sum of its proper divisors (60581208).

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

28864512 is an frugal number, since it uses more digits than its factorization.

28864512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 34 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 28864512 is about 5372.5703345792. The cubic root of 28864512 is about 306.7524733632.

The spelling of 28864512 in words is "twenty-eight million, eight hundred sixty-four thousand, five hundred twelve".