28001625 has 32 divisors (see below), whose sum is σ = 47174400. Its totient is φ = 14748800.

The previous prime is 28001621. The next prime is 28001651. The reversal of 28001625 is 52610082.

It is not a de Polignac number, because 28001625 - 2² = 28001621 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28001595 and 28001604.

It is not an unprimeable number, because it can be changed into a prime (28001621) 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 31 ways as a sum of consecutive naturals, for example, 32956 + ... + 33794.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^28001625 is an apocalyptic number.

28001625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28001625 is a deficient number, since it is larger than the sum of its proper divisors (19172775).

28001625 is an equidigital number, since it uses as much as digits as its factorization.

28001625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 936 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 28001625 is about 5291.6561679686. The cubic root of 28001625 is about 303.6647714276.

The spelling of 28001625 in words is "twenty-eight million, one thousand, six hundred twenty-five".