28521125 has 16 divisors (see below), whose sum is σ = 35745840. Its totient is φ = 22720000.

The previous prime is 28521107. The next prime is 28521137. The reversal of 28521125 is 52112582.

It can be written as a sum of positive squares in 8 ways, for example, as 5317636 + 23203489 = 2306^2 + 4817^2 .

It is not a de Polignac number, because 28521125 - 2¹⁴ = 28504741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28521094 and 28521103.

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 15 ways as a sum of consecutive naturals, for example, 49841 + ... + 50409.

It is an arithmetic number, because the mean of its divisors is an integer number (2234115).

Almost surely, 2^28521125 is an apocalyptic number.

28521125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28521125 is a deficient number, since it is larger than the sum of its proper divisors (7224715).

28521125 is an equidigital number, since it uses as much as digits as its factorization.

28521125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985 (or 975 counting only the distinct ones).

The product of its digits is 1600, while the sum is 26.

The square root of 28521125 is about 5340.5172970416. The cubic root of 28521125 is about 305.5311893640.

The spelling of 28521125 in words is "twenty-eight million, five hundred twenty-one thousand, one hundred twenty-five".