28338225 has 12 divisors (see below), whose sum is σ = 46852656. Its totient is φ = 15113680.

The previous prime is 28338187. The next prime is 28338229. The reversal of 28338225 is 52283382.

It is not a de Polignac number, because 28338225 - 2¹¹ = 28336177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28338229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188847 + ... + 188996.

It is an arithmetic number, because the mean of its divisors is an integer number (3904388).

Almost surely, 2^28338225 is an apocalyptic number.

28338225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28338225 is a deficient number, since it is larger than the sum of its proper divisors (18514431).

28338225 is a wasteful number, since it uses less digits than its factorization.

28338225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377856 (or 377851 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 28338225 is about 5323.3659464666. The cubic root of 28338225 is about 304.8766857942.

It can be divided in two parts, 28 and 338225, that added together give a triangular number (338253 = T₈₂₂).

The spelling of 28338225 in words is "twenty-eight million, three hundred thirty-eight thousand, two hundred twenty-five".