25280228 has 12 divisors (see below), whose sum is σ = 45766140. Its totient is φ = 12204192.

The previous prime is 25280201. The next prime is 25280273. The reversal of 25280228 is 82208252.

It can be written as a sum of positive squares in 2 ways, for example, as 18939904 + 6340324 = 4352^2 + 2518^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 25280228.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108851 + ... + 109082.

It is an arithmetic number, because the mean of its divisors is an integer number (3813845).

Almost surely, 2^25280228 is an apocalyptic number.

It is an amenable number.

25280228 is a deficient number, since it is larger than the sum of its proper divisors (20485912).

25280228 is a wasteful number, since it uses less digits than its factorization.

25280228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217966 (or 217964 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 25280228 is about 5027.9447093221. The cubic root of 25280228 is about 293.4902391727.

The spelling of 25280228 in words is "twenty-five million, two hundred eighty thousand, two hundred twenty-eight".