28481125 has 8 divisors (see below), whose sum is σ = 35544600. Its totient is φ = 22784800.

The previous prime is 28481119. The next prime is 28481149. The reversal of 28481125 is 52118482.

It can be written as a sum of positive squares in 4 ways, for example, as 4656964 + 23824161 = 2158^2 + 4881^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28481125 is a prime.

It is a super-2 number, since 2×28481125² = 1622348962531250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113800 + ... + 114049.

It is an arithmetic number, because the mean of its divisors is an integer number (4443075).

Almost surely, 2^28481125 is an apocalyptic number.

28481125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28481125 is a deficient number, since it is larger than the sum of its proper divisors (7063475).

28481125 is an equidigital number, since it uses as much as digits as its factorization.

28481125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227864 (or 227854 counting only the distinct ones).

The product of its digits is 5120, while the sum is 31.

The square root of 28481125 is about 5336.7710275034. The cubic root of 28481125 is about 305.3882898426.

The spelling of 28481125 in words is "twenty-eight million, four hundred eighty-one thousand, one hundred twenty-five".