78724212 has 96 divisors (see below), whose sum is σ = 230065920. Its totient is φ = 20428800.

The previous prime is 78724207. The next prime is 78724213. The reversal of 78724212 is 21242787.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78724213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40462 + ... + 42362.

It is an arithmetic number, because the mean of its divisors is an integer number (2396520).

Almost surely, 2^78724212 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 78724212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115032960).

78724212 is an abundant number, since it is smaller than the sum of its proper divisors (151341708).

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

78724212 is a wasteful number, since it uses less digits than its factorization.

78724212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961 (or 1959 counting only the distinct ones).

The product of its digits is 12544, while the sum is 33.

The square root of 78724212 is about 8872.6665664838. Note that the first 3 decimals coincide. The cubic root of 78724212 is about 428.5841515588.

Adding to 78724212 its reverse (21242787), we get a palindrome (99966999).

The spelling of 78724212 in words is "seventy-eight million, seven hundred twenty-four thousand, two hundred twelve".