78789859 has 4 divisors (see below), whose sum is σ = 79318800. Its totient is φ = 78260920.

The previous prime is 78789833. The next prime is 78789863. The reversal of 78789859 is 95898787.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78789859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78789797 and 78789806.

It is not an unprimeable number, because it can be changed into a prime (78784859) 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, 264247 + ... + 264544.

It is an arithmetic number, because the mean of its divisors is an integer number (19829700).

Almost surely, 2^78789859 is an apocalyptic number.

78789859 is a deficient number, since it is larger than the sum of its proper divisors (528941).

78789859 is a wasteful number, since it uses less digits than its factorization.

78789859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528940.

The product of its digits is 10160640, while the sum is 61.

The square root of 78789859 is about 8876.3651907749. The cubic root of 78789859 is about 428.7032485353.

The spelling of 78789859 in words is "seventy-eight million, seven hundred eighty-nine thousand, eight hundred fifty-nine".