287676561 has 8 divisors (see below), whose sum is σ = 383660640. Its totient is φ = 191738432.

The previous prime is 287676551. The next prime is 287676619. The reversal of 287676561 is 165676782.

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 287676561 - 2¹⁹ = 287152273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 287676561.

It is not an unprimeable number, because it can be changed into a prime (287676551) 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 7 ways as a sum of consecutive naturals, for example, 7705 + ... + 25193.

It is an arithmetic number, because the mean of its divisors is an integer number (47957580).

Almost surely, 2^287676561 is an apocalyptic number.

It is an amenable number.

287676561 is a deficient number, since it is larger than the sum of its proper divisors (95984079).

287676561 is a wasteful number, since it uses less digits than its factorization.

287676561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22975.

The product of its digits is 846720, while the sum is 48.

The square root of 287676561 is about 16961.0306585420. The cubic root of 287676561 is about 660.1381414240.

The spelling of 287676561 in words is "two hundred eighty-seven million, six hundred seventy-six thousand, five hundred sixty-one".