71986989735 has 32 divisors (see below), whose sum is σ = 129172942080. Its totient is φ = 38034239904.

The previous prime is 71986989703. The next prime is 71986989749. The reversal of 71986989735 is 53798968917.

It is not a de Polignac number, because 71986989735 - 2⁵ = 71986989703 is a prime.

It is a super-2 number, since 2×71986989735² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2477317 + ... + 2506206.

It is an arithmetic number, because the mean of its divisors is an integer number (4036654440).

Almost surely, 2^71986989735 is an apocalyptic number.

71986989735 is a deficient number, since it is larger than the sum of its proper divisors (57185952345).

71986989735 is a wasteful number, since it uses less digits than its factorization.

71986989735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4983644 (or 4983638 counting only the distinct ones).

The product of its digits is 205752960, while the sum is 72.

The spelling of 71986989735 in words is "seventy-one billion, nine hundred eighty-six million, nine hundred eighty-nine thousand, seven hundred thirty-five".