78838678 has 4 divisors (see below), whose sum is σ = 118258020. Its totient is φ = 39419338.

The previous prime is 78838637. The next prime is 78838709. The reversal of 78838678 is 87683887.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19709668 + ... + 19709671.

It is an arithmetic number, because the mean of its divisors is an integer number (29564505).

Almost surely, 2^78838678 is an apocalyptic number.

78838678 is a deficient number, since it is larger than the sum of its proper divisors (39419342).

78838678 is a wasteful number, since it uses less digits than its factorization.

78838678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39419341.

The product of its digits is 3612672, while the sum is 55.

The square root of 78838678 is about 8879.1147081227. The cubic root of 78838678 is about 428.7917732222.

It can be divided in two parts, 7883 and 8678, that added together give a palindrome (16561).

The spelling of 78838678 in words is "seventy-eight million, eight hundred thirty-eight thousand, six hundred seventy-eight".