28329625 has 8 divisors (see below), whose sum is σ = 35355528. Its totient is φ = 22663600.

The previous prime is 28329557. The next prime is 28329649. The reversal of 28329625 is 52692382.

It can be written as a sum of positive squares in 4 ways, for example, as 2715904 + 25613721 = 1648^2 + 5061^2 .

It is not a de Polignac number, because 28329625 - 2¹⁷ = 28198553 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113194 + ... + 113443.

It is an arithmetic number, because the mean of its divisors is an integer number (4419441).

Almost surely, 2^28329625 is an apocalyptic number.

28329625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28329625 is a deficient number, since it is larger than the sum of its proper divisors (7025903).

28329625 is an equidigital number, since it uses as much as digits as its factorization.

28329625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226652 (or 226642 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 28329625 is about 5322.5581255633. The cubic root of 28329625 is about 304.8458416514.

The spelling of 28329625 in words is "twenty-eight million, three hundred twenty-nine thousand, six hundred twenty-five".