28275225 has 24 divisors (see below), whose sum is σ = 50999712. Its totient is φ = 13708800.

The previous prime is 28275223. The next prime is 28275227. The reversal of 28275225 is 52257282.

It is an interprime number because it is at equal distance from previous prime (28275223) and next prime (28275227).

It is not a de Polignac number, because 28275225 - 2¹ = 28275223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28275223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16312 + ... + 17961.

It is an arithmetic number, because the mean of its divisors is an integer number (2124988).

Almost surely, 2^28275225 is an apocalyptic number.

28275225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28275225 is a deficient number, since it is larger than the sum of its proper divisors (22724487).

28275225 is a wasteful number, since it uses less digits than its factorization.

28275225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34297 (or 34292 counting only the distinct ones).

The product of its digits is 22400, while the sum is 33.

The square root of 28275225 is about 5317.4453452762. The cubic root of 28275225 is about 304.6505897432.

The spelling of 28275225 in words is "twenty-eight million, two hundred seventy-five thousand, two hundred twenty-five".