28151225 has 12 divisors (see below), whose sum is σ = 35256300. Its totient is φ = 22296000.

The previous prime is 28151213. The next prime is 28151251. The reversal of 28151225 is 52215182.

It can be written as a sum of positive squares in 6 ways, for example, as 71824 + 28079401 = 268^2 + 5299^2 .

It is not a de Polignac number, because 28151225 - 2²⁴ = 11374009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28151194 and 28151203.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3050 + ... + 8099.

It is an arithmetic number, because the mean of its divisors is an integer number (2938025).

Almost surely, 2^28151225 is an apocalyptic number.

28151225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28151225 is a deficient number, since it is larger than the sum of its proper divisors (7105075).

28151225 is a wasteful number, since it uses less digits than its factorization.

28151225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11260 (or 11255 counting only the distinct ones).

The product of its digits is 1600, while the sum is 26.

The square root of 28151225 is about 5305.7727995081. The cubic root of 28151225 is about 304.2045923394.

The spelling of 28151225 in words is "twenty-eight million, one hundred fifty-one thousand, two hundred twenty-five".