28028625 has 32 divisors (see below), whose sum is σ = 47803392. Its totient is φ = 14576000.

The previous prime is 28028593. The next prime is 28028641. The reversal of 28028625 is 52682082.

It is not a de Polignac number, because 28028625 - 2⁵ = 28028593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14464 + ... + 16286.

It is an arithmetic number, because the mean of its divisors is an integer number (1493856).

Almost surely, 2^28028625 is an apocalyptic number.

28028625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28028625 is a deficient number, since it is larger than the sum of its proper divisors (19774767).

28028625 is a wasteful number, since it uses less digits than its factorization.

28028625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882 (or 1872 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 28028625 is about 5294.2067394464. The cubic root of 28028625 is about 303.7623409438.

The spelling of 28028625 in words is "twenty-eight million, twenty-eight thousand, six hundred twenty-five".