71985711 has 8 divisors (see below), whose sum is σ = 109692544. Its totient is φ = 41134680.

The previous prime is 71985707. The next prime is 71985733. The reversal of 71985711 is 11758917.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71985711 - 2² = 71985707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71985711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71985761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1713925 + ... + 1713966.

It is an arithmetic number, because the mean of its divisors is an integer number (13711568).

Almost surely, 2^71985711 is an apocalyptic number.

71985711 is a deficient number, since it is larger than the sum of its proper divisors (37706833).

71985711 is a wasteful number, since it uses less digits than its factorization.

71985711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427901.

The product of its digits is 17640, while the sum is 39.

The square root of 71985711 is about 8484.4393450599. The cubic root of 71985711 is about 415.9892421250.

The spelling of 71985711 in words is "seventy-one million, nine hundred eighty-five thousand, seven hundred eleven".