78911551744 has 81 divisors (see below), whose sum is σ = 160039630611. Its totient is φ = 38833274880.

The previous prime is 78911551699. The next prime is 78911551751. The reversal of 78911551744 is 44715511987.

The square root of 78911551744 is 280912.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 35193760000 + 43717791744 = 187600^2 + 209088^2 .

It is a Duffinian number.

Its product of digits (1411200) is a multiple of the sum of its prime divisors (280).

It is a junction number, because it is equal to n+sod(n) for n = 78911551691 and 78911551700.

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 8 ways as a sum of consecutive naturals, for example, 435975334 + ... + 435975514.

Almost surely, 2^78911551744 is an apocalyptic number.

78911551744 is the 280912-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78911551744

78911551744 is an abundant number, since it is smaller than the sum of its proper divisors (81128078867).

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

78911551744 is an frugal number, since it uses more digits than its factorization.

78911551744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 280 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 52.

The spelling of 78911551744 in words is "seventy-eight billion, nine hundred eleven million, five hundred fifty-one thousand, seven hundred forty-four".