28612864 has 54 divisors (see below), whose sum is σ = 66467814. Its totient is φ = 12257280.

The previous prime is 28612849. The next prime is 28612967. The reversal of 28612864 is 46821682.

It can be written as a sum of positive squares in only one way, i.e., 25401600 + 3211264 = 5040^2 + 1792^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11404 + ... + 13684.

Almost surely, 2^28612864 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 28612864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33233907).

28612864 is an abundant number, since it is smaller than the sum of its proper divisors (37854950).

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

28612864 is an equidigital number, since it uses as much as digits as its factorization.

28612864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311 (or 2290 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 28612864 is about 5349.0993634443. The cubic root of 28612864 is about 305.8584219821.

The spelling of 28612864 in words is "twenty-eight million, six hundred twelve thousand, eight hundred sixty-four".