28786304 has 32 divisors (see below), whose sum is σ = 60725700. Its totient is φ = 13545472.

The previous prime is 28786301. The next prime is 28786319. The reversal of 28786304 is 40368782.

28786304 = T₁₇₉ + T₁₈₀ + ... + T₅₆₂.

It can be written as a sum of positive squares in 2 ways, for example, as 21603904 + 7182400 = 4648^2 + 2680^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (28786301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4439 + ... + 8790.

Almost surely, 2^28786304 is an apocalyptic number.

It is an amenable number.

28786304 is an abundant number, since it is smaller than the sum of its proper divisors (31939396).

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

28786304 is a wasteful number, since it uses less digits than its factorization.

28786304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13260 (or 13248 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 28786304 is about 5365.2869447961. The cubic root of 28786304 is about 306.4751755586.

The spelling of 28786304 in words is "twenty-eight million, seven hundred eighty-six thousand, three hundred four".