78409543212 has 480 divisors, whose sum is σ = 276350215680. Its totient is φ = 18722119680.

The previous prime is 78409543171. The next prime is 78409543249. The reversal of 78409543212 is 21234590487.

78409543212 is a `hidden beast` number, since 7 + 84 + 0 + 9 + 543 + 21 + 2 = 666.

It is a super-2 number, since 2×78409543212² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 135891468 + ... + 135892044.

It is an arithmetic number, because the mean of its divisors is an integer number (575729616).

Almost surely, 2^78409543212 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 78409543212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138175107840).

78409543212 is an abundant number, since it is smaller than the sum of its proper divisors (197940672468).

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

78409543212 is a wasteful number, since it uses less digits than its factorization.

78409543212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043 (or 1032 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 78409543212 in words is "seventy-eight billion, four hundred nine million, five hundred forty-three thousand, two hundred twelve".