28785984 has 56 divisors (see below), whose sum is σ = 76565760. Its totient is φ = 9544704.

The previous prime is 28785983. The next prime is 28786001. The reversal of 28785984 is 48958782.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785983) by changing a digit.

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, 59857 + ... + 60335.

Almost surely, 2^28785984 is an apocalyptic number.

28785984 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 28785984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38282880).

28785984 is an abundant number, since it is smaller than the sum of its proper divisors (47779776).

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

28785984 is a wasteful number, since it uses less digits than its factorization.

28785984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 797 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 51.

The square root of 28785984 is about 5365.2571233819. The cubic root of 28785984 is about 306.4740399211.

The spelling of 28785984 in words is "twenty-eight million, seven hundred eighty-five thousand, nine hundred eighty-four".