28009476 has 120 divisors (see below), whose sum is σ = 82938240. Its totient is φ = 8164800.

The previous prime is 28009463. The next prime is 28009537. The reversal of 28009476 is 67490082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28009476.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 103221 + ... + 103491.

It is an arithmetic number, because the mean of its divisors is an integer number (691152).

Almost surely, 2^28009476 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28009476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41469120).

28009476 is an abundant number, since it is smaller than the sum of its proper divisors (54928764).

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

28009476 is a wasteful number, since it uses less digits than its factorization.

28009476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 28009476 is about 5292.3979442215. The cubic root of 28009476 is about 303.6931489395.

The spelling of 28009476 in words is "twenty-eight million, nine thousand, four hundred seventy-six".