28312825 has 12 divisors (see below), whose sum is σ = 35458668. Its totient is φ = 22424000.

The previous prime is 28312819. The next prime is 28312829. The reversal of 28312825 is 52821382.

It can be written as a sum of positive squares in 6 ways, for example, as 561001 + 27751824 = 749^2 + 5268^2 .

It is not a de Polignac number, because 28312825 - 2⁹ = 28312313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28312829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3082 + ... + 8131.

It is an arithmetic number, because the mean of its divisors is an integer number (2954889).

Almost surely, 2^28312825 is an apocalyptic number.

28312825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28312825 is a deficient number, since it is larger than the sum of its proper divisors (7145843).

28312825 is a wasteful number, since it uses less digits than its factorization.

28312825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11324 (or 11319 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 28312825 is about 5320.9797030246. The cubic root of 28312825 is about 304.7855699648.

The spelling of 28312825 in words is "twenty-eight million, three hundred twelve thousand, eight hundred twenty-five".