78940818 has 80 divisors (see below), whose sum is σ = 199330560. Its totient is φ = 23133600.

The previous prime is 78940817. The next prime is 78940847. The reversal of 78940818 is 81804987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78940817) 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 39 ways as a sum of consecutive naturals, for example, 54528 + ... + 55956.

It is an arithmetic number, because the mean of its divisors is an integer number (2491632).

Almost surely, 2^78940818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78940818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99665280).

78940818 is an abundant number, since it is smaller than the sum of its proper divisors (120389742).

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

78940818 is a wasteful number, since it uses less digits than its factorization.

78940818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485 (or 1476 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 78940818 is about 8884.8645459568. The cubic root of 78940818 is about 428.9768680373.

The spelling of 78940818 in words is "seventy-eight million, nine hundred forty thousand, eight hundred eighteen".