79872681856 has 64 divisors (see below), whose sum is σ = 174279288960. Its totient is φ = 36160960000.

The previous prime is 79872681853. The next prime is 79872681907. The reversal of 79872681856 is 65818627897.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 79872681791 and 79872681800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79872681853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240405 + ... + 466411.

It is an arithmetic number, because the mean of its divisors is an integer number (2723113890).

Almost surely, 2^79872681856 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 79872681856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87139644480).

79872681856 is an abundant number, since it is smaller than the sum of its proper divisors (94406607104).

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

79872681856 is a wasteful number, since it uses less digits than its factorization.

79872681856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226283 (or 226271 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 67.

The spelling of 79872681856 in words is "seventy-nine billion, eight hundred seventy-two million, six hundred eighty-one thousand, eight hundred fifty-six".