78118212 has 48 divisors (see below), whose sum is σ = 190955520. Its totient is φ = 24808608.

The previous prime is 78118207. The next prime is 78118217. The reversal of 78118212 is 21281187.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78118207) and next prime (78118217).

It is a super-2 number, since 2×78118212² = 12204910092153888, 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 78118212.

It is not an unprimeable number, because it can be changed into a prime (78118217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105339 + ... + 106077.

It is an arithmetic number, because the mean of its divisors is an integer number (3978240).

Almost surely, 2^78118212 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 78118212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95477760).

78118212 is an abundant number, since it is smaller than the sum of its proper divisors (112837308).

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

78118212 is a wasteful number, since it uses less digits than its factorization.

78118212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152 (or 1150 counting only the distinct ones).

The product of its digits is 1792, while the sum is 30.

The square root of 78118212 is about 8838.4507692242. The cubic root of 78118212 is about 427.4816051727.

Adding to 78118212 its reverse (21281187), we get a palindrome (99399399).

The spelling of 78118212 in words is "seventy-eight million, one hundred eighteen thousand, two hundred twelve".