78820818 has 8 divisors (see below), whose sum is σ = 157641648. Its totient is φ = 26273604.

The previous prime is 78820813. The next prime is 78820831. The reversal of 78820818 is 81802887.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

78820818 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 78820818.

It is not an unprimeable number, because it can be changed into a prime (78820813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6568396 + ... + 6568407.

It is an arithmetic number, because the mean of its divisors is an integer number (19705206).

Almost surely, 2^78820818 is an apocalyptic number.

78820818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78820818 is a wasteful number, since it uses less digits than its factorization.

78820818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13136808.

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 78820818 is about 8878.1089202600. The cubic root of 78820818 is about 428.7593914877.

The spelling of 78820818 in words is "seventy-eight million, eight hundred twenty thousand, eight hundred eighteen".