28009425 has 12 divisors (see below), whose sum is σ = 46309040. Its totient is φ = 14938320.

The previous prime is 28009393. The next prime is 28009427. The reversal of 28009425 is 52490082.

It is not a de Polignac number, because 28009425 - 2⁵ = 28009393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28009392 and 28009401.

It is not an unprimeable number, because it can be changed into a prime (28009427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186655 + ... + 186804.

Almost surely, 2^28009425 is an apocalyptic number.

28009425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28009425 is a deficient number, since it is larger than the sum of its proper divisors (18299615).

28009425 is a wasteful number, since it uses less digits than its factorization.

28009425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373472 (or 373467 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 28009425 is about 5292.3931259875. The cubic root of 28009425 is about 303.6929646167.

The spelling of 28009425 in words is "twenty-eight million, nine thousand, four hundred twenty-five".