78678018 has 24 divisors (see below), whose sum is σ = 171428400. Its totient is φ = 26078424.

The previous prime is 78678001. The next prime is 78678029. The reversal of 78678018 is 81087687.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8988 + ... + 15431.

It is an arithmetic number, because the mean of its divisors is an integer number (7142850).

Almost surely, 2^78678018 is an apocalyptic number.

78678018 is an abundant number, since it is smaller than the sum of its proper divisors (92750382).

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

78678018 is a wasteful number, since it uses less digits than its factorization.

78678018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24606 (or 24603 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 78678018 is about 8870.0630211966. The cubic root of 78678018 is about 428.5003065788.

The spelling of 78678018 in words is "seventy-eight million, six hundred seventy-eight thousand, eighteen".