168987865 has 8 divisors (see below), whose sum is σ = 202904640. Its totient is φ = 135110832.

The previous prime is 168987853. The next prime is 168987883. The reversal of 168987865 is 568789861.

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 168987865 - 2⁷ = 168987737 is a prime.

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, 402 + ... + 18388.

It is an arithmetic number, because the mean of its divisors is an integer number (25363080).

Almost surely, 2^168987865 is an apocalyptic number.

It is an amenable number.

168987865 is a deficient number, since it is larger than the sum of its proper divisors (33916775).

168987865 is a wasteful number, since it uses less digits than its factorization.

168987865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19871.

The product of its digits is 5806080, while the sum is 58.

The square root of 168987865 is about 12999.5332608521. The cubic root of 168987865 is about 552.8642479777.

The spelling of 168987865 in words is "one hundred sixty-eight million, nine hundred eighty-seven thousand, eight hundred sixty-five".