68188989 has 32 divisors (see below), whose sum is σ = 105722496. Its totient is φ = 38635520.

The previous prime is 68188973. The next prime is 68188993. The reversal of 68188989 is 98988186.

It is not a de Polignac number, because 68188989 - 2⁴ = 68188973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68188909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110209 + ... + 110825.

It is an arithmetic number, because the mean of its divisors is an integer number (3303828).

Almost surely, 2^68188989 is an apocalyptic number.

It is an amenable number.

68188989 is a deficient number, since it is larger than the sum of its proper divisors (37533507).

68188989 is a wasteful number, since it uses less digits than its factorization.

68188989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845.

The product of its digits is 1990656, while the sum is 57.

The square root of 68188989 is about 8257.6624416356. The cubic root of 68188989 is about 408.5432917559.

The spelling of 68188989 in words is "sixty-eight million, one hundred eighty-eight thousand, nine hundred eighty-nine".