91729069867 has 16 divisors (see below), whose sum is σ = 98361490752. Its totient is φ = 85330516480.

The previous prime is 91729069853. The next prime is 91729069871. The reversal of 91729069867 is 76896092719.

It is not a de Polignac number, because 91729069867 - 2³¹ = 89581586219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91729069799 and 91729069808.

It is not an unprimeable number, because it can be changed into a prime (91729069807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145503 + ... + 452359.

It is an arithmetic number, because the mean of its divisors is an integer number (6147593172).

Almost surely, 2^91729069867 is an apocalyptic number.

91729069867 is a deficient number, since it is larger than the sum of its proper divisors (6632420885).

91729069867 is a wasteful number, since it uses less digits than its factorization.

91729069867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307238.

The product of its (nonzero) digits is 20575296, while the sum is 64.

The spelling of 91729069867 in words is "ninety-one billion, seven hundred twenty-nine million, sixty-nine thousand, eight hundred sixty-seven".