78729672671 has 32 divisors (see below), whose sum is σ = 88632774720. Its totient is φ = 69431040000.

The previous prime is 78729672643. The next prime is 78729672733. The reversal of 78729672671 is 17627692787.

It is a cyclic number.

It is not a de Polignac number, because 78729672671 - 2¹⁴ = 78729656287 is a prime.

It is a super-2 number, since 2×78729672671² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78729672611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34974296 + ... + 34976546.

It is an arithmetic number, because the mean of its divisors is an integer number (2769774210).

Almost surely, 2^78729672671 is an apocalyptic number.

78729672671 is a deficient number, since it is larger than the sum of its proper divisors (9903102049).

78729672671 is a wasteful number, since it uses less digits than its factorization.

78729672671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227.

The product of its digits is 24893568, while the sum is 62.

The spelling of 78729672671 in words is "seventy-eight billion, seven hundred twenty-nine million, six hundred seventy-two thousand, six hundred seventy-one".