28784384 has 36 divisors (see below), whose sum is σ = 57824760. Its totient is φ = 14300160.

The previous prime is 28784381. The next prime is 28784407. The reversal of 28784384 is 48348782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28784381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58379 + ... + 58869.

Almost surely, 2^28784384 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 28784384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28912380).

28784384 is an abundant number, since it is smaller than the sum of its proper divisors (29040376).

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

28784384 is an equidigital number, since it uses as much as digits as its factorization.

28784384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736 (or 722 counting only the distinct ones).

The product of its digits is 344064, while the sum is 44.

The square root of 28784384 is about 5365.1080138241. The cubic root of 28784384 is about 306.4683616073.

The spelling of 28784384 in words is "twenty-eight million, seven hundred eighty-four thousand, three hundred eighty-four".