28717056 has 156 divisors (see below), whose sum is σ = 89445720. Its totient is φ = 8847360.

The previous prime is 28717021. The next prime is 28717079. The reversal of 28717056 is 65071782.

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 28717056.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 700396 + ... + 700436.

It is an arithmetic number, because the mean of its divisors is an integer number (573370).

Almost surely, 2^28717056 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 28717056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44722860).

28717056 is an abundant number, since it is smaller than the sum of its proper divisors (60728664).

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

28717056 is a wasteful number, since it uses less digits than its factorization.

28717056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 28717056 is about 5358.8297229899. The cubic root of 28717056 is about 306.2292271902.

The spelling of 28717056 in words is "twenty-eight million, seven hundred seventeen thousand, fifty-six".