287223144 has 128 divisors (see below), whose sum is σ = 804249600. Its totient is φ = 84913920.

The previous prime is 287223137. The next prime is 287223169. The reversal of 287223144 is 441322782.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1059729 + ... + 1059999.

It is an arithmetic number, because the mean of its divisors is an integer number (6283200).

Almost surely, 2^287223144 is an apocalyptic number.

287223144 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 287223144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (402124800).

287223144 is an abundant number, since it is smaller than the sum of its proper divisors (517026456).

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

287223144 is a wasteful number, since it uses less digits than its factorization.

287223144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415 (or 411 counting only the distinct ones).

The product of its digits is 21504, while the sum is 33.

The square root of 287223144 is about 16947.6589533776. The cubic root of 287223144 is about 659.7911368488.

The spelling of 287223144 in words is "two hundred eighty-seven million, two hundred twenty-three thousand, one hundred forty-four".