28666584 has 72 divisors (see below), whose sum is σ = 79669980. Its totient is φ = 9311040.

The previous prime is 28666571. The next prime is 28666591. The reversal of 28666584 is 48566682.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 267859 + ... + 267965.

Almost surely, 2^28666584 is an apocalyptic number.

28666584 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28666584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39834990).

28666584 is an abundant number, since it is smaller than the sum of its proper divisors (51003396).

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

28666584 is a wasteful number, since it uses less digits than its factorization.

28666584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 173 counting only the distinct ones).

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

The square root of 28666584 is about 5354.1184148280. The cubic root of 28666584 is about 306.0497163870.

The spelling of 28666584 in words is "twenty-eight million, six hundred sixty-six thousand, five hundred eighty-four".