287280013 has 8 divisors (see below), whose sum is σ = 291686328. Its totient is φ = 282906624.

The previous prime is 287279939. The next prime is 287280017. The reversal of 287280013 is 310082782.

It can be written as a sum of positive squares in 4 ways, for example, as 23444964 + 263835049 = 4842^2 + 16243^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 287280013 - 2¹³ = 287271821 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 (287280017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9645 + ... + 25837.

It is an arithmetic number, because the mean of its divisors is an integer number (36460791).

Almost surely, 2^287280013 is an apocalyptic number.

It is an amenable number.

287280013 is a deficient number, since it is larger than the sum of its proper divisors (4406315).

287280013 is a wasteful number, since it uses less digits than its factorization.

287280013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16463.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 287280013 is about 16949.3366536865. The cubic root of 287280013 is about 659.8346792847.

The spelling of 287280013 in words is "two hundred eighty-seven million, two hundred eighty thousand, thirteen".