28320325 has 12 divisors (see below), whose sum is σ = 38310048. Its totient is φ = 20596400.

The previous prime is 28320323. The next prime is 28320343. The reversal of 28320325 is 52302382.

It is not a de Polignac number, because 28320325 - 2¹ = 28320323 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 28320325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28320323) 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, 51217 + ... + 51766.

It is an arithmetic number, because the mean of its divisors is an integer number (3192504).

Almost surely, 2^28320325 is an apocalyptic number.

28320325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28320325 is a deficient number, since it is larger than the sum of its proper divisors (9989723).

28320325 is a wasteful number, since it uses less digits than its factorization.

28320325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103004 (or 102999 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 28320325 is about 5321.6844137923. The cubic root of 28320325 is about 304.8124799130.

The spelling of 28320325 in words is "twenty-eight million, three hundred twenty thousand, three hundred twenty-five".