287896985 has 8 divisors (see below), whose sum is σ = 345568776. Its totient is φ = 230256000.

The previous prime is 287896979. The next prime is 287896991. The reversal of 287896985 is 589698782.

It is an interprime number because it is at equal distance from previous prime (287896979) and next prime (287896991).

It can be written as a sum of positive squares in 4 ways, for example, as 11539609 + 276357376 = 3397^2 + 16624^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-287896985 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27485 + ... + 36485.

It is an arithmetic number, because the mean of its divisors is an integer number (43196097).

Almost surely, 2^287896985 is an apocalyptic number.

It is an amenable number.

287896985 is a deficient number, since it is larger than the sum of its proper divisors (57671791).

287896985 is an equidigital number, since it uses as much as digits as its factorization.

287896985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15403.

The product of its digits is 17418240, while the sum is 62.

The square root of 287896985 is about 16967.5273684765. The cubic root of 287896985 is about 660.3067024179.

The spelling of 287896985 in words is "two hundred eighty-seven million, eight hundred ninety-six thousand, nine hundred eighty-five".