78144018 has 32 divisors (see below), whose sum is σ = 165338496. Its totient is φ = 24571008.

The previous prime is 78143999. The next prime is 78144071. The reversal of 78144018 is 81044187.

It is a super-2 number, since 2×78144018² = 12212975098368648, 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 78144018.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6196 + ... + 13952.

It is an arithmetic number, because the mean of its divisors is an integer number (5166828).

Almost surely, 2^78144018 is an apocalyptic number.

78144018 is an abundant number, since it is smaller than the sum of its proper divisors (87194478).

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

78144018 is a wasteful number, since it uses less digits than its factorization.

78144018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7858.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 78144018 is about 8839.9105199091. The cubic root of 78144018 is about 427.5286721989.

The spelling of 78144018 in words is "seventy-eight million, one hundred forty-four thousand, eighteen".