78678834 has 32 divisors (see below), whose sum is σ = 171225600. Its totient is φ = 23956992.

The previous prime is 78678833. The next prime is 78678841. The reversal of 78678834 is 43887687.

It is not an unprimeable number, because it can be changed into a prime (78678833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2367 + ... + 12765.

It is an arithmetic number, because the mean of its divisors is an integer number (5350800).

Almost surely, 2^78678834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78678834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85612800).

78678834 is an abundant number, since it is smaller than the sum of its proper divisors (92546766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78678834 is a wasteful number, since it uses less digits than its factorization.

78678834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10514.

The product of its digits is 1806336, while the sum is 51.

The square root of 78678834 is about 8870.1090184958. The cubic root of 78678834 is about 428.5017879542.

The spelling of 78678834 in words is "seventy-eight million, six hundred seventy-eight thousand, eight hundred thirty-four".