78589889 has 4 divisors (see below), whose sum is σ = 89817024. Its totient is φ = 67362756.

The previous prime is 78589879. The next prime is 78589943. The reversal of 78589889 is 98898587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78589889 - 2²⁰ = 77541313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78589879) 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, 5613557 + ... + 5613570.

It is an arithmetic number, because the mean of its divisors is an integer number (22454256).

Almost surely, 2^78589889 is an apocalyptic number.

It is an amenable number.

78589889 is a deficient number, since it is larger than the sum of its proper divisors (11227135).

78589889 is a wasteful number, since it uses less digits than its factorization.

78589889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11227134.

The product of its digits is 11612160, while the sum is 62.

The square root of 78589889 is about 8865.0938517311. The cubic root of 78589889 is about 428.3402558933.

The spelling of 78589889 in words is "seventy-eight million, five hundred eighty-nine thousand, eight hundred eighty-nine".