79781856 has 192 divisors, whose sum is σ = 268240896. Its totient is φ = 20160000.

The previous prime is 79781851. The next prime is 79781857. The reversal of 79781856 is 65818797.

It is a junction number, because it is equal to n+sod(n) for n = 79781799 and 79781808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79781851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 317731 + ... + 317981.

It is an arithmetic number, because the mean of its divisors is an integer number (1397088).

Almost surely, 2^79781856 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 79781856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134120448).

79781856 is an abundant number, since it is smaller than the sum of its proper divisors (188459040).

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

79781856 is a wasteful number, since it uses less digits than its factorization.

79781856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 317 counting only the distinct ones).

The product of its digits is 846720, while the sum is 51.

The square root of 79781856 is about 8932.0689652510. The cubic root of 79781856 is about 430.4949339838.

The spelling of 79781856 in words is "seventy-nine million, seven hundred eighty-one thousand, eight hundred fifty-six".