28770784 has 96 divisors (see below), whose sum is σ = 69189120. Its totient is φ = 11515392.

The previous prime is 28770767. The next prime is 28770799. The reversal of 28770784 is 48707782.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 28770784.

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 15 ways as a sum of consecutive naturals, for example, 279277 + ... + 279379.

It is an arithmetic number, because the mean of its divisors is an integer number (720720).

Almost surely, 2^28770784 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 28770784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34594560).

28770784 is an abundant number, since it is smaller than the sum of its proper divisors (40418336).

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

28770784 is a wasteful number, since it uses less digits than its factorization.

28770784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 43.

The square root of 28770784 is about 5363.8404152249. The cubic root of 28770784 is about 306.4200874423.

The spelling of 28770784 in words is "twenty-eight million, seven hundred seventy thousand, seven hundred eighty-four".