28628025 has 12 divisors (see below), whose sum is σ = 47331792. Its totient is φ = 15268240.

The previous prime is 28628021. The next prime is 28628027. The reversal of 28628025 is 52082682.

It is not a de Polignac number, because 28628025 - 2² = 28628021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28628021) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 190779 + ... + 190928.

It is an arithmetic number, because the mean of its divisors is an integer number (3944316).

Almost surely, 2^28628025 is an apocalyptic number.

28628025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28628025 is a deficient number, since it is larger than the sum of its proper divisors (18703767).

28628025 is a wasteful number, since it uses less digits than its factorization.

28628025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381720 (or 381715 counting only the distinct ones).

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

The square root of 28628025 is about 5350.5163302246. The cubic root of 28628025 is about 305.9124338274.

The spelling of 28628025 in words is "twenty-eight million, six hundred twenty-eight thousand, twenty-five".