78326674967640 has 256 divisors, whose sum is σ = 266514632294400. Its totient is φ = 18243558489600.

The previous prime is 78326674967627. The next prime is 78326674967641. The reversal of 78326674967640 is 4676947662387.

It is a super-2 number, since 2×78326674967640² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78326674967641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1197522 + ... + 12573281.

It is an arithmetic number, because the mean of its divisors is an integer number (1041072782400).

Almost surely, 2^{78326674967640} 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 78326674967640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133257316147200).

78326674967640 is an abundant number, since it is smaller than the sum of its proper divisors (188187957326760).

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

78326674967640 is a wasteful number, since it uses less digits than its factorization.

78326674967640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13770998 (or 13770994 counting only the distinct ones).

The product of its (nonzero) digits is 3072577536, while the sum is 75.

The spelling of 78326674967640 in words is "seventy-eight trillion, three hundred twenty-six billion, six hundred seventy-four million, nine hundred sixty-seven thousand, six hundred forty".