78888889 has 8 divisors (see below), whose sum is σ = 81088128. Its totient is φ = 76711440.

The previous prime is 78888871. The next prime is 78888911. The reversal of 78888889 is 98888887.

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 78888889 - 2⁹ = 78888377 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 78888889.

It is not an unprimeable number, because it can be changed into a prime (78888829) 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, 2034 + ... + 12724.

It is an arithmetic number, because the mean of its divisors is an integer number (10136016).

Almost surely, 2^78888889 is an apocalyptic number.

It is an amenable number.

78888889 is a deficient number, since it is larger than the sum of its proper divisors (2199239).

78888889 is a wasteful number, since it uses less digits than its factorization.

78888889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10895.

The product of its digits is 16515072, while the sum is 64.

The square root of 78888889 is about 8881.9417359044. The cubic root of 78888889 is about 428.8827839426.

The spelling of 78888889 in words is "seventy-eight million, eight hundred eighty-eight thousand, eight hundred eighty-nine".