28009395 has 24 divisors (see below), whose sum is σ = 50349936. Its totient is φ = 14937696.

The previous prime is 28009393. The next prime is 28009427. The reversal of 28009395 is 59390082.

It is not a de Polignac number, because 28009395 - 2¹ = 28009393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28009393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10312 + ... + 12741.

It is an arithmetic number, because the mean of its divisors is an integer number (2097914).

Almost surely, 2^28009395 is an apocalyptic number.

28009395 is a deficient number, since it is larger than the sum of its proper divisors (22340541).

28009395 is an equidigital number, since it uses as much as digits as its factorization.

28009395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23073 (or 23061 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 28009395 is about 5292.3902917302. The cubic root of 28009395 is about 303.6928561914.

The spelling of 28009395 in words is "twenty-eight million, nine thousand, three hundred ninety-five".