28009386 has 24 divisors (see below), whose sum is σ = 61012224. Its totient is φ = 9286440.

The previous prime is 28009381. The next prime is 28009393. The reversal of 28009386 is 68390082.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28009386.

It is not an unprimeable number, because it can be changed into a prime (28009381) 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, 636 + ... + 7511.

It is an arithmetic number, because the mean of its divisors is an integer number (2542176).

Almost surely, 2^28009386 is an apocalyptic number.

28009386 is an abundant number, since it is smaller than the sum of its proper divisors (33002838).

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

28009386 is a wasteful number, since it uses less digits than its factorization.

28009386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8346 (or 8343 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28009386 is about 5292.3894414527. The cubic root of 28009386 is about 303.6928236637.

The spelling of 28009386 in words is "twenty-eight million, nine thousand, three hundred eighty-six".