28252225 has 24 divisors (see below), whose sum is σ = 36122688. Its totient is φ = 21912000.

The previous prime is 28252219. The next prime is 28252243. The reversal of 28252225 is 52225282.

It is not a de Polignac number, because 28252225 - 2¹¹ = 28250177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28252193 and 28252202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169092 + ... + 169258.

It is an arithmetic number, because the mean of its divisors is an integer number (1505112).

Almost surely, 2^28252225 is an apocalyptic number.

28252225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28252225 is a deficient number, since it is larger than the sum of its proper divisors (7870463).

28252225 is a wasteful number, since it uses less digits than its factorization.

28252225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345 (or 340 counting only the distinct ones).

The product of its digits is 6400, while the sum is 28.

The square root of 28252225 is about 5315.2822126393. The cubic root of 28252225 is about 304.5679630582.

It can be divided in two parts, 2825 and 2225, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 28252225 in words is "twenty-eight million, two hundred fifty-two thousand, two hundred twenty-five".