71720536436 has 24 divisors (see below), whose sum is σ = 129872856960. Its totient is φ = 34632747072.

The previous prime is 71720536399. The next prime is 71720536477. The reversal of 71720536436 is 63463502717.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2327276 + ... + 2357891.

It is an arithmetic number, because the mean of its divisors is an integer number (5411369040).

Almost surely, 2^71720536436 is an apocalyptic number.

It is an amenable number.

71720536436 is a deficient number, since it is larger than the sum of its proper divisors (58152320524).

71720536436 is a wasteful number, since it uses less digits than its factorization.

71720536436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685303 (or 4685301 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 44.

The spelling of 71720536436 in words is "seventy-one billion, seven hundred twenty million, five hundred thirty-six thousand, four hundred thirty-six".