28181325 has 72 divisors (see below), whose sum is σ = 53193024. Its totient is φ = 13094400.

The previous prime is 28181317. The next prime is 28181347. The reversal of 28181325 is 52318182.

It is not a de Polignac number, because 28181325 - 2³ = 28181317 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28181292 and 28181301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 909060 + ... + 909090.

It is an arithmetic number, because the mean of its divisors is an integer number (738792).

Almost surely, 2^28181325 is an apocalyptic number.

28181325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28181325 is a deficient number, since it is larger than the sum of its proper divisors (25011699).

28181325 is a wasteful number, since it uses less digits than its factorization.

28181325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 79 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 28181325 is about 5308.6085747585. The cubic root of 28181325 is about 304.3129747951.

The spelling of 28181325 in words is "twenty-eight million, one hundred eighty-one thousand, three hundred twenty-five".