78396637212 has 96 divisors (see below), whose sum is σ = 213758361600. Its totient is φ = 24799110336.

The previous prime is 78396637183. The next prime is 78396637213. The reversal of 78396637212 is 21273669387.

78396637212 is a `hidden beast` number, since 7 + 8 + 396 + 6 + 37 + 212 = 666.

It is a super-2 number, since 2×78396637212² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78396637213) 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, 191214 + ... + 439722.

It is an arithmetic number, because the mean of its divisors is an integer number (2226649600).

Almost surely, 2^78396637212 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 78396637212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106879180800).

78396637212 is an abundant number, since it is smaller than the sum of its proper divisors (135361724388).

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

78396637212 is a wasteful number, since it uses less digits than its factorization.

78396637212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248672 (or 248664 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The spelling of 78396637212 in words is "seventy-eight billion, three hundred ninety-six million, six hundred thirty-seven thousand, two hundred twelve".