28304872 has 16 divisors (see below), whose sum is σ = 53129700. Its totient is φ = 14136960.

The previous prime is 28304869. The next prime is 28304897. The reversal of 28304872 is 27840382.

It can be written as a sum of positive squares in 2 ways, for example, as 27394756 + 910116 = 5234^2 + 954^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10654 + ... + 13042.

Almost surely, 2^28304872 is an apocalyptic number.

It is an amenable number.

28304872 is a deficient number, since it is larger than the sum of its proper divisors (24824828).

28304872 is a wasteful number, since it uses less digits than its factorization.

28304872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876 (or 3872 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 28304872 is about 5320.2323257542. The cubic root of 28304872 is about 304.7570294638.

The spelling of 28304872 in words is "twenty-eight million, three hundred four thousand, eight hundred seventy-two".