28005325 has 12 divisors (see below), whose sum is σ = 34872768. Its totient is φ = 22310000.

The previous prime is 28005317. The next prime is 28005331. The reversal of 28005325 is 52350082.

It is not a de Polignac number, because 28005325 - 2³ = 28005317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28005325.

It is a congruent number.

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, 4044 + ... + 8506.

It is an arithmetic number, because the mean of its divisors is an integer number (2906064).

Almost surely, 2^28005325 is an apocalyptic number.

28005325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28005325 is a deficient number, since it is larger than the sum of its proper divisors (6867443).

28005325 is a wasteful number, since it uses less digits than its factorization.

28005325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4724 (or 4719 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 28005325 is about 5292.0057634133. The cubic root of 28005325 is about 303.6781457725.

The spelling of 28005325 in words is "twenty-eight million, five thousand, three hundred twenty-five".