28208285 has 16 divisors (see below), whose sum is σ = 38779776. Its totient is φ = 19295808.

The previous prime is 28208267. The next prime is 28208317. The reversal of 28208285 is 58280282.

It is not a de Polignac number, because 28208285 - 2⁸ = 28208029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19859 + ... + 21231.

It is an arithmetic number, because the mean of its divisors is an integer number (2423736).

Almost surely, 2^28208285 is an apocalyptic number.

It is an amenable number.

28208285 is a deficient number, since it is larger than the sum of its proper divisors (10571491).

28208285 is a wasteful number, since it uses less digits than its factorization.

28208285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972.

The product of its (nonzero) digits is 20480, while the sum is 35.

The square root of 28208285 is about 5311.1472395331. The cubic root of 28208285 is about 304.4099854094.

The spelling of 28208285 in words is "twenty-eight million, two hundred eight thousand, two hundred eighty-five".