28502784 has 108 divisors (see below), whose sum is σ = 83701800. Its totient is φ = 9326592.

The previous prime is 28502783. The next prime is 28502791. The reversal of 28502784 is 48720582.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28502783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204987 + ... + 205125.

Almost surely, 2^28502784 is an apocalyptic number.

28502784 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 28502784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41850900).

28502784 is an abundant number, since it is smaller than the sum of its proper divisors (55199016).

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

28502784 is a wasteful number, since it uses less digits than its factorization.

28502784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28502784 is about 5338.7998651382. The cubic root of 28502784 is about 305.4656829582.

The spelling of 28502784 in words is "twenty-eight million, five hundred two thousand, seven hundred eighty-four".