28278275 has 6 divisors (see below), whose sum is σ = 35065092. Its totient is φ = 22622600.

The previous prime is 28278253. The next prime is 28278301. The reversal of 28278275 is 57287282.

It is a happy number.

It is not a de Polignac number, because 28278275 - 2¹⁰ = 28277251 is a prime.

It is a Duffinian number.

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, 565541 + ... + 565590.

It is an arithmetic number, because the mean of its divisors is an integer number (5844182).

Almost surely, 2^28278275 is an apocalyptic number.

28278275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28278275 is a deficient number, since it is larger than the sum of its proper divisors (6786817).

28278275 is a wasteful number, since it uses less digits than its factorization.

28278275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131141 (or 1131136 counting only the distinct ones).

The product of its digits is 125440, while the sum is 41.

The square root of 28278275 is about 5317.7321293950. The cubic root of 28278275 is about 304.6615433948.

The spelling of 28278275 in words is "twenty-eight million, two hundred seventy-eight thousand, two hundred seventy-five".