287680005 has 20 divisors (see below), whose sum is σ = 515693772. Its totient is φ = 153429120.

The previous prime is 287679991. The next prime is 287680009. The reversal of 287680005 is 500086782.

It can be written as a sum of positive squares in 2 ways, for example, as 206841924 + 80838081 = 14382^2 + 8991^2 .

It is not a de Polignac number, because 287680005 - 2⁴ = 287679989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287680009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 354756 + ... + 355565.

Almost surely, 2^287680005 is an apocalyptic number.

It is an amenable number.

287680005 is a deficient number, since it is larger than the sum of its proper divisors (228013767).

287680005 is an equidigital number, since it uses as much as digits as its factorization.

287680005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710338 (or 710329 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 287680005 is about 16961.1321850872. The cubic root of 287680005 is about 660.1407757560.

The spelling of 287680005 in words is "two hundred eighty-seven million, six hundred eighty thousand, five".