866898987 has 4 divisors (see below), whose sum is σ = 1155865320. Its totient is φ = 577932656.

The previous prime is 866898983. The next prime is 866899009. The reversal of 866898987 is 789898668.

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 866898987 - 2² = 866898983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866898983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144483162 + ... + 144483167.

It is an arithmetic number, because the mean of its divisors is an integer number (288966330).

Almost surely, 2^866898987 is an apocalyptic number.

866898987 is a deficient number, since it is larger than the sum of its proper divisors (288966333).

866898987 is a wasteful number, since it uses less digits than its factorization.

866898987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288966332.

The product of its digits is 83607552, while the sum is 69.

The square root of 866898987 is about 29443.1483880376. The cubic root of 866898987 is about 953.5046862051.

The spelling of 866898987 in words is "eight hundred sixty-six million, eight hundred ninety-eight thousand, nine hundred eighty-seven".