28311325 has 12 divisors (see below), whose sum is σ = 40121440. Its totient is φ = 19413360.

The previous prime is 28311323. The next prime is 28311331. The reversal of 28311325 is 52311382.

It is not a de Polignac number, because 28311325 - 2¹ = 28311323 is a prime.

It is a super-2 number, since 2×28311325² = 1603062246511250, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28311325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28311323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80715 + ... + 81064.

Almost surely, 2^28311325 is an apocalyptic number.

28311325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28311325 is a deficient number, since it is larger than the sum of its proper divisors (11810115).

28311325 is a wasteful number, since it uses less digits than its factorization.

28311325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161796 (or 161791 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 28311325 is about 5320.8387496710. The cubic root of 28311325 is about 304.7801874050.

The spelling of 28311325 in words is "twenty-eight million, three hundred eleven thousand, three hundred twenty-five".