78336918 has 108 divisors (see below), whose sum is σ = 202152132. Its totient is φ = 21738240.

The previous prime is 78336893. The next prime is 78336949. The reversal of 78336918 is 81963387.

It is a happy number.

It is a super-2 number, since 2×78336918² = 12273345443477448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 2117196 + ... + 2117232.

It is an arithmetic number, because the mean of its divisors is an integer number (1871779).

Almost surely, 2^78336918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78336918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101076066).

78336918 is an abundant number, since it is smaller than the sum of its proper divisors (123815214).

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

78336918 is a wasteful number, since it uses less digits than its factorization.

78336918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 70 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 78336918 is about 8850.8145387868. The cubic root of 78336918 is about 427.8801706930.

It can be divided in two parts, 783369 and 18, that added together give a palindrome (783387).

The spelling of 78336918 in words is "seventy-eight million, three hundred thirty-six thousand, nine hundred eighteen".