28784658 has 48 divisors (see below), whose sum is σ = 70506720. Its totient is φ = 7789824.

The previous prime is 28784629. The next prime is 28784663. The reversal of 28784658 is 85648782.

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, 3010 + ... + 8162.

It is an arithmetic number, because the mean of its divisors is an integer number (1468890).

Almost surely, 2^28784658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28784658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35253360).

28784658 is an abundant number, since it is smaller than the sum of its proper divisors (41722062).

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

28784658 is a wasteful number, since it uses less digits than its factorization.

28784658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5191 (or 5184 counting only the distinct ones).

The product of its digits is 860160, while the sum is 48.

The square root of 28784658 is about 5365.1335491300. The cubic root of 28784658 is about 306.4693340335.

The spelling of 28784658 in words is "twenty-eight million, seven hundred eighty-four thousand, six hundred fifty-eight".