78644140016 has 40 divisors (see below), whose sum is σ = 172730559120. Its totient is φ = 34386909696.

The previous prime is 78644140009. The next prime is 78644140021. The reversal of 78644140016 is 61004144687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9945965 + ... + 9953868.

It is an arithmetic number, because the mean of its divisors is an integer number (4318263978).

Almost surely, 2^78644140016 is an apocalyptic number.

78644140016 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

78644140016 is an abundant number, since it is smaller than the sum of its proper divisors (94086419104).

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

78644140016 is a wasteful number, since it uses less digits than its factorization.

78644140016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19899873 (or 19899867 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 78644140016 in words is "seventy-eight billion, six hundred forty-four million, one hundred forty thousand, sixteen".