287222688 has 144 divisors (see below), whose sum is σ = 860461056. Its totient is φ = 90754560.

The previous prime is 287222659. The next prime is 287222713. The reversal of 287222688 is 886222782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

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 23 ways as a sum of consecutive naturals, for example, 472881 + ... + 473487.

It is an arithmetic number, because the mean of its divisors is an integer number (5975424).

Almost surely, 2^287222688 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 287222688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (430230528).

287222688 is an abundant number, since it is smaller than the sum of its proper divisors (573238368).

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

287222688 is a wasteful number, since it uses less digits than its factorization.

287222688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 696 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 287222688 is about 16947.6455001867. The cubic root of 287222688 is about 659.7907876836.

The spelling of 287222688 in words is "two hundred eighty-seven million, two hundred twenty-two thousand, six hundred eighty-eight".