78228621186688 has 128 divisors (see below), whose sum is σ = 184133475210240. Its totient is φ = 32395957862400.

The previous prime is 78228621186671. The next prime is 78228621186809. The reversal of 78228621186688 is 88668112682287.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×78228621186688² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78228621186688.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16229520 + ... + 20490352.

It is an arithmetic number, because the mean of its divisors is an integer number (1438542775080).

Almost surely, 2^{78228621186688} 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 78228621186688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92066737605120).

78228621186688 is an abundant number, since it is smaller than the sum of its proper divisors (105904854023552).

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

78228621186688 is a wasteful number, since it uses less digits than its factorization.

78228621186688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4261546 (or 4261534 counting only the distinct ones).

The product of its digits is 396361728, while the sum is 73.

The spelling of 78228621186688 in words is "seventy-eight trillion, two hundred twenty-eight billion, six hundred twenty-one million, one hundred eighty-six thousand, six hundred eighty-eight".