28009338 has 16 divisors (see below), whose sum is σ = 64021440. Its totient is φ = 8002656.

The previous prime is 28009327. The next prime is 28009343. The reversal of 28009338 is 83390082.

It is a junction number, because it is equal to n+sod(n) for n = 28009299 and 28009308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333403 + ... + 333486.

It is an arithmetic number, because the mean of its divisors is an integer number (4001340).

Almost surely, 2^28009338 is an apocalyptic number.

28009338 is an abundant number, since it is smaller than the sum of its proper divisors (36012102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28009338 is a wasteful number, since it uses less digits than its factorization.

28009338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666901.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 28009338 is about 5292.3849066371. The cubic root of 28009338 is about 303.6926501830.

The spelling of 28009338 in words is "twenty-eight million, nine thousand, three hundred thirty-eight".