78838679 has 4 divisors (see below), whose sum is σ = 79459584. Its totient is φ = 78217776.

The previous prime is 78838637. The next prime is 78838709. The reversal of 78838679 is 97683887.

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

It is a de Polignac number, because none of the positive numbers 2^k-78838679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78838609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310262 + ... + 310515.

It is an arithmetic number, because the mean of its divisors is an integer number (19864896).

Almost surely, 2^78838679 is an apocalyptic number.

78838679 is a deficient number, since it is larger than the sum of its proper divisors (620905).

78838679 is a wasteful number, since it uses less digits than its factorization.

78838679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620904.

The product of its digits is 4064256, while the sum is 56.

The square root of 78838679 is about 8879.1147644346. The cubic root of 78838679 is about 428.7917750352.

The spelling of 78838679 in words is "seventy-eight million, eight hundred thirty-eight thousand, six hundred seventy-nine".