28776625 has 8 divisors (see below), whose sum is σ = 35913384. Its totient is φ = 23021200.

The previous prime is 28776607. The next prime is 28776641. The reversal of 28776625 is 52667782.

It can be written as a sum of positive squares in 4 ways, for example, as 431649 + 28344976 = 657^2 + 5324^2 .

It is not a de Polignac number, because 28776625 - 2⁵ = 28776593 is a prime.

It is a Duffinian number.

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, 114982 + ... + 115231.

It is an arithmetic number, because the mean of its divisors is an integer number (4489173).

Almost surely, 2^28776625 is an apocalyptic number.

28776625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28776625 is a deficient number, since it is larger than the sum of its proper divisors (7136759).

28776625 is an equidigital number, since it uses as much as digits as its factorization.

28776625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230228 (or 230218 counting only the distinct ones).

The product of its digits is 282240, while the sum is 43.

The square root of 28776625 is about 5364.3848668790. The cubic root of 28776625 is about 306.4408223496.

The spelling of 28776625 in words is "twenty-eight million, seven hundred seventy-six thousand, six hundred twenty-five".