287342639 has 4 divisors (see below), whose sum is σ = 289978920. Its totient is φ = 284706360.

The previous prime is 287342633. The next prime is 287342651. The reversal of 287342639 is 936243782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 287342639 - 2⁴ = 287342623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 287342639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287342633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1317977 + ... + 1318194.

It is an arithmetic number, because the mean of its divisors is an integer number (72494730).

Almost surely, 2^287342639 is an apocalyptic number.

287342639 is a deficient number, since it is larger than the sum of its proper divisors (2636281).

287342639 is a wasteful number, since it uses less digits than its factorization.

287342639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636280.

The product of its digits is 435456, while the sum is 44.

The square root of 287342639 is about 16951.1839999453. The cubic root of 287342639 is about 659.8826229893.

The spelling of 287342639 in words is "two hundred eighty-seven million, three hundred forty-two thousand, six hundred thirty-nine".