287215992 has 144 divisors (see below), whose sum is σ = 920153520. Its totient is φ = 79280640.

The previous prime is 287215991. The next prime is 287215997. The reversal of 287215992 is 299512782.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287215991) 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 35 ways as a sum of consecutive naturals, for example, 484048 + ... + 484640.

It is an arithmetic number, because the mean of its divisors is an integer number (6389955).

Almost surely, 2^287215992 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 287215992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460076760).

287215992 is an abundant number, since it is smaller than the sum of its proper divisors (632937528).

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

287215992 is a wasteful number, since it uses less digits than its factorization.

287215992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674 (or 636 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 287215992 is about 16947.4479494702. The cubic root of 287215992 is about 659.7856604268.

The spelling of 287215992 in words is "two hundred eighty-seven million, two hundred fifteen thousand, nine hundred ninety-two".