78891660120 has 512 divisors, whose sum is σ = 303657984000. Its totient is φ = 16285925376.

The previous prime is 78891660119. The next prime is 78891660149. The reversal of 78891660120 is 2106619887.

It is a self number, because there is not a number n which added to its sum of digits gives 78891660120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 25147192 + ... + 25150328.

It is an arithmetic number, because the mean of its divisors is an integer number (593082000).

Almost surely, 2^78891660120 is an apocalyptic number.

78891660120 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78891660120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151828992000).

78891660120 is an abundant number, since it is smaller than the sum of its proper divisors (224766323880).

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

78891660120 is a wasteful number, since it uses less digits than its factorization.

78891660120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3232 (or 3214 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 78891660120 in words is "seventy-eight billion, eight hundred ninety-one million, six hundred sixty thousand, one hundred twenty".