28768784 has 40 divisors (see below), whose sum is σ = 61162752. Its totient is φ = 13000320.

The previous prime is 28768687. The next prime is 28768799. The reversal of 28768784 is 48786782.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38882 + ... + 39614.

Almost surely, 2^28768784 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 28768784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30581376).

28768784 is an abundant number, since it is smaller than the sum of its proper divisors (32393968).

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

28768784 is a wasteful number, since it uses less digits than its factorization.

28768784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975 (or 969 counting only the distinct ones).

The product of its digits is 1204224, while the sum is 50.

The square root of 28768784 is about 5363.6539783994. The cubic root of 28768784 is about 306.4129870173.

The spelling of 28768784 in words is "twenty-eight million, seven hundred sixty-eight thousand, seven hundred eighty-four".