28212132625 has 8 divisors (see below), whose sum is σ = 35208741672. Its totient is φ = 22569706000.

The previous prime is 28212132593. The next prime is 28212132643. The reversal of 28212132625 is 52623121282.

It can be written as a sum of positive squares in 4 ways, for example, as 6869260161 + 21342872464 = 82881^2 + 146092^2 .

It is not a de Polignac number, because 28212132625 - 2⁵ = 28212132593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112848406 + ... + 112848655.

It is an arithmetic number, because the mean of its divisors is an integer number (4401092709).

Almost surely, 2^28212132625 is an apocalyptic number.

28212132625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28212132625 is a deficient number, since it is larger than the sum of its proper divisors (6996609047).

28212132625 is an equidigital number, since it uses as much as digits as its factorization.

28212132625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225697076 (or 225697066 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The spelling of 28212132625 in words is "twenty-eight billion, two hundred twelve million, one hundred thirty-two thousand, six hundred twenty-five".