78765918 has 64 divisors (see below), whose sum is σ = 198167040. Its totient is φ = 20444160.

The previous prime is 78765889. The next prime is 78765931. The reversal of 78765918 is 81956787.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 55198 + ... + 56606.

It is an arithmetic number, because the mean of its divisors is an integer number (3096360).

Almost surely, 2^78765918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78765918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99083520).

78765918 is an abundant number, since it is smaller than the sum of its proper divisors (119401122).

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

78765918 is a wasteful number, since it uses less digits than its factorization.

78765918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454 (or 1432 counting only the distinct ones).

The product of its digits is 846720, while the sum is 51.

The square root of 78765918 is about 8875.0165070269. The cubic root of 78765918 is about 428.6598223705.

The spelling of 78765918 in words is "seventy-eight million, seven hundred sixty-five thousand, nine hundred eighteen".