168231987 has 72 divisors (see below), whose sum is σ = 316199520. Its totient is φ = 84268800.

The previous prime is 168231971. The next prime is 168231989. The reversal of 168231987 is 789132861.

It is not a de Polignac number, because 168231987 - 2⁴ = 168231971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168231989) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 220687 + ... + 221447.

It is an arithmetic number, because the mean of its divisors is an integer number (4391660).

Almost surely, 2^168231987 is an apocalyptic number.

168231987 is a deficient number, since it is larger than the sum of its proper divisors (147967533).

168231987 is a wasteful number, since it uses less digits than its factorization.

168231987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 811 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 168231987 is about 12970.4274023642. The cubic root of 168231987 is about 552.0387004215.

The spelling of 168231987 in words is "one hundred sixty-eight million, two hundred thirty-one thousand, nine hundred eighty-seven".