78418384 has 40 divisors (see below), whose sum is σ = 167257152. Its totient is φ = 35320320.

The previous prime is 78418343. The next prime is 78418391. The reversal of 78418384 is 48381487.

It is a super-2 number, since 2×78418384² = 12298885898342912, 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 78418384.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 17917 + ... + 21859.

Almost surely, 2^78418384 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 78418384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83628576).

78418384 is an abundant number, since it is smaller than the sum of its proper divisors (88838768).

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

78418384 is a wasteful number, since it uses less digits than its factorization.

78418384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075 (or 4069 counting only the distinct ones).

The product of its digits is 172032, while the sum is 43.

The square root of 78418384 is about 8855.4155182013. The cubic root of 78418384 is about 428.0284430977.

The spelling of 78418384 in words is "seventy-eight million, four hundred eighteen thousand, three hundred eighty-four".