28009926 has 96 divisors (see below), whose sum is σ = 73322496. Its totient is φ = 7560000.

The previous prime is 28009913. The next prime is 28009937. The reversal of 28009926 is 62990082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 277276 + ... + 277376.

It is an arithmetic number, because the mean of its divisors is an integer number (763776).

Almost surely, 2^28009926 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28009926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36661248).

28009926 is an abundant number, since it is smaller than the sum of its proper divisors (45312570).

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

28009926 is a wasteful number, since it uses less digits than its factorization.

28009926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 28009926 is about 5292.4404578606. The cubic root of 28009926 is about 303.6947753080.

The spelling of 28009926 in words is "twenty-eight million, nine thousand, nine hundred twenty-six".