78251366712720 has 320 divisors, whose sum is σ = 257038108508160. Its totient is φ = 19637958297600.

The previous prime is 78251366712671. The next prime is 78251366712731. The reversal of 78251366712720 is 2721766315287.

It is a happy number.

It is a super-2 number, since 2×78251366712720² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1234392225 + ... + 1234455615.

It is an arithmetic number, because the mean of its divisors is an integer number (803244089088).

Almost surely, 2^{78251366712720} 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 78251366712720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128519054254080).

78251366712720 is an abundant number, since it is smaller than the sum of its proper divisors (178786741795440).

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

78251366712720 is a wasteful number, since it uses less digits than its factorization.

78251366712720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65214 (or 65208 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 57.

The spelling of 78251366712720 in words is "seventy-eight trillion, two hundred fifty-one billion, three hundred sixty-six million, seven hundred twelve thousand, seven hundred twenty".