28287996 has 72 divisors (see below), whose sum is σ = 74737152. Its totient is φ = 8258400.

The previous prime is 28287929. The next prime is 28288019. The reversal of 28287996 is 69978282.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126741 + ... + 126963.

It is an arithmetic number, because the mean of its divisors is an integer number (1038016).

Almost surely, 2^28287996 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 28287996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37368576).

28287996 is an abundant number, since it is smaller than the sum of its proper divisors (46449156).

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

28287996 is a wasteful number, since it uses less digits than its factorization.

28287996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 270 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The square root of 28287996 is about 5318.6460683148. The cubic root of 28287996 is about 304.6964497621.

The spelling of 28287996 in words is "twenty-eight million, two hundred eighty-seven thousand, nine hundred ninety-six".