28646784 has 112 divisors (see below), whose sum is σ = 85844220. Its totient is φ = 9517824.

The previous prime is 28646777. The next prime is 28646831. The reversal of 28646784 is 48764682.

It is a congruent number.

It is an unprimeable number.

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 13 ways as a sum of consecutive naturals, for example, 93159 + ... + 93465.

Almost surely, 2^28646784 is an apocalyptic number.

28646784 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 28646784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42922110).

28646784 is an abundant number, since it is smaller than the sum of its proper divisors (57197436).

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

28646784 is an frugal number, since it uses more digits than its factorization.

28646784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339 (or 312 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 28646784 is about 5352.2690515332. The cubic root of 28646784 is about 305.9792373456.

It can be divided in two parts, 2864678 and 4, that added together give a palindrome (2864682).

The spelling of 28646784 in words is "twenty-eight million, six hundred forty-six thousand, seven hundred eighty-four".