168888889 has 4 divisors (see below), whose sum is σ = 181880356. Its totient is φ = 155897424.

The previous prime is 168888883. The next prime is 168888893. The reversal of 168888889 is 988888861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988888861 = 17 ⋅58169933.

It can be written as a sum of positive squares in 2 ways, for example, as 70224400 + 98664489 = 8380^2 + 9933^2 .

It is a cyclic number.

It is not a de Polignac number, because 168888889 - 2¹⁹ = 168364601 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 168888889.

It is not an unprimeable number, because it can be changed into a prime (168888883) 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, 6495714 + ... + 6495739.

It is an arithmetic number, because the mean of its divisors is an integer number (45470089).

Almost surely, 2^168888889 is an apocalyptic number.

It is an amenable number.

168888889 is a deficient number, since it is larger than the sum of its proper divisors (12991467).

168888889 is a wasteful number, since it uses less digits than its factorization.

168888889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12991466.

The product of its digits is 14155776, while the sum is 64.

The square root of 168888889 is about 12995.7257973535. The cubic root of 168888889 is about 552.7562895779.

The spelling of 168888889 in words is "one hundred sixty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-nine".