78668189 has 8 divisors (see below), whose sum is σ = 83307840. Its totient is φ = 74078496.

The previous prime is 78668171. The next prime is 78668203. The reversal of 78668189 is 98186687.

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 78668189 - 2¹² = 78664093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78668189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78668159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9224 + ... + 15569.

It is an arithmetic number, because the mean of its divisors is an integer number (10413480).

Almost surely, 2^78668189 is an apocalyptic number.

It is an amenable number.

78668189 is a deficient number, since it is larger than the sum of its proper divisors (4639651).

78668189 is a wasteful number, since it uses less digits than its factorization.

78668189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24979.

The product of its digits is 1161216, while the sum is 53.

The square root of 78668189 is about 8869.5089492034. The cubic root of 78668189 is about 428.4824620990.

The spelling of 78668189 in words is "seventy-eight million, six hundred sixty-eight thousand, one hundred eighty-nine".