28104285 has 32 divisors (see below), whose sum is σ = 49766400. Its totient is φ = 13428800.

The previous prime is 28104239. The next prime is 28104319. The reversal of 28104285 is 58240182.

28104285 = T₂₂₅₅ + T₂₂₅₆ + ... + T₂₂₆₅.

It is not a de Polignac number, because 28104285 - 2⁹ = 28103773 is a prime.

It is a super-2 number, since 2×28104285² = 1579701670722450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10516 + ... + 12914.

It is an arithmetic number, because the mean of its divisors is an integer number (1555200).

Almost surely, 2^28104285 is an apocalyptic number.

It is an amenable number.

28104285 is a deficient number, since it is larger than the sum of its proper divisors (21662115).

28104285 is a wasteful number, since it uses less digits than its factorization.

28104285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 28104285 is about 5301.3474702192. The cubic root of 28104285 is about 304.0354190322.

The spelling of 28104285 in words is "twenty-eight million, one hundred four thousand, two hundred eighty-five".