168428987 has 4 divisors (see below), whose sum is σ = 168455040. Its totient is φ = 168402936.

The previous prime is 168428959. The next prime is 168429017. The reversal of 168428987 is 789824861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 168428987 - 2⁸ = 168428731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168428087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4838 + ... + 18980.

It is an arithmetic number, because the mean of its divisors is an integer number (42113760).

Almost surely, 2^168428987 is an apocalyptic number.

168428987 is a deficient number, since it is larger than the sum of its proper divisors (26053).

168428987 is a wasteful number, since it uses less digits than its factorization.

168428987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26052.

The product of its digits is 1548288, while the sum is 53.

The square root of 168428987 is about 12978.0193789345. The cubic root of 168428987 is about 552.2540958487.

The spelling of 168428987 in words is "one hundred sixty-eight million, four hundred twenty-eight thousand, nine hundred eighty-seven".