287705223 has 16 divisors (see below), whose sum is σ = 459017440. Its totient is φ = 177049152.

The previous prime is 287705207. The next prime is 287705261. The reversal of 287705223 is 322507782.

It is a happy number.

It is not a de Polignac number, because 287705223 - 2⁴ = 287705207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287705273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409486 + ... + 410187.

It is an arithmetic number, because the mean of its divisors is an integer number (28688590).

Almost surely, 2^287705223 is an apocalyptic number.

287705223 is a deficient number, since it is larger than the sum of its proper divisors (171312217).

287705223 is a wasteful number, since it uses less digits than its factorization.

287705223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819695 (or 819689 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 287705223 is about 16961.8755743579. The cubic root of 287705223 is about 660.1600644835.

The spelling of 287705223 in words is "two hundred eighty-seven million, seven hundred five thousand, two hundred twenty-three".