28261325 has 12 divisors (see below), whose sum is σ = 35111220. Its totient is φ = 22565760.

The previous prime is 28261307. The next prime is 28261391. The reversal of 28261325 is 52316282.

It can be written as a sum of positive squares in 6 ways, for example, as 1283689 + 26977636 = 1133^2 + 5194^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28261325 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21281 + ... + 22569.

It is an arithmetic number, because the mean of its divisors is an integer number (2925935).

Almost surely, 2^28261325 is an apocalyptic number.

28261325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28261325 is a deficient number, since it is larger than the sum of its proper divisors (6849895).

28261325 is a wasteful number, since it uses less digits than its factorization.

28261325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176 (or 2171 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 28261325 is about 5316.1381659998. The cubic root of 28261325 is about 304.6006598452.

The spelling of 28261325 in words is "twenty-eight million, two hundred sixty-one thousand, three hundred twenty-five".