78218336 has 48 divisors (see below), whose sum is σ = 182075040. Its totient is φ = 32363520.

The previous prime is 78218323. The next prime is 78218389. The reversal of 78218336 is 63381287.

It is a happy number.

It is a super-2 number, since 2×78218336² = 12236216173217792, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78218336.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476 + ... + 12516.

It is an arithmetic number, because the mean of its divisors is an integer number (3793230).

Almost surely, 2^78218336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78218336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91037520).

78218336 is an abundant number, since it is smaller than the sum of its proper divisors (103856704).

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

78218336 is a wasteful number, since it uses less digits than its factorization.

78218336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12087 (or 12079 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 78218336 is about 8844.1130702858. The cubic root of 78218336 is about 427.6641613872.

The spelling of 78218336 in words is "seventy-eight million, two hundred eighteen thousand, three hundred thirty-six".