28564812 has 60 divisors (see below), whose sum is σ = 75355896. Its totient is φ = 9434880.

The previous prime is 28564807. The next prime is 28564819. The reversal of 28564812 is 21846582.

28564812 is a `hidden beast` number, since 2 + 8 + 5 + 648 + 1 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (28564819) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42108 + ... + 42780.

Almost surely, 2^28564812 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 28564812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37677948).

28564812 is an abundant number, since it is smaller than the sum of its proper divisors (46791084).

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

28564812 is a wasteful number, since it uses less digits than its factorization.

28564812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820 (or 809 counting only the distinct ones).

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

The square root of 28564812 is about 5344.6058788277. The cubic root of 28564812 is about 305.6871080823.

The spelling of 28564812 in words is "twenty-eight million, five hundred sixty-four thousand, eight hundred twelve".