79389169873920 has 440 divisors, whose sum is σ = 284610600689184. Its totient is φ = 21161165635584.

The previous prime is 79389169873919. The next prime is 79389169873933. The reversal of 79389169873920 is 2937896198397.

79389169873920 is a `hidden beast` number, since 7 + 9 + 3 + 8 + 91 + 69 + 87 + 392 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a self number, because there is not a number n which added to its sum of digits gives 79389169873920.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 973307059 + ... + 973388621.

Almost surely, 2^{79389169873920} 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 79389169873920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142305300344592).

79389169873920 is an abundant number, since it is smaller than the sum of its proper divisors (205221430815264).

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

79389169873920 is a wasteful number, since it uses less digits than its factorization.

79389169873920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83947 (or 83920 counting only the distinct ones).

The product of its (nonzero) digits is 2222131968, while the sum is 81.

The spelling of 79389169873920 in words is "seventy-nine trillion, three hundred eighty-nine billion, one hundred sixty-nine million, eight hundred seventy-three thousand, nine hundred twenty".