28564668 has 72 divisors (see below), whose sum is σ = 80314416. Its totient is φ = 8486400.

The previous prime is 28564621. The next prime is 28564687. The reversal of 28564668 is 86646582.

28564668 is a `hidden beast` number, since 28 + 564 + 6 + 68 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20308 + ... + 21668.

It is an arithmetic number, because the mean of its divisors is an integer number (1115478).

Almost surely, 2^28564668 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 28564668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40157208).

28564668 is an abundant number, since it is smaller than the sum of its proper divisors (51749748).

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

28564668 is a wasteful number, since it uses less digits than its factorization.

28564668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435 (or 1430 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 28564668 is about 5344.5924072842. The cubic root of 28564668 is about 305.6865944082.

The spelling of 28564668 in words is "twenty-eight million, five hundred sixty-four thousand, six hundred sixty-eight".