71985986 has 8 divisors (see below), whose sum is σ = 108155280. Its totient is φ = 35934228.

The previous prime is 71985971. The next prime is 71985997. The reversal of 71985986 is 68958917.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27836 + ... + 30311.

It is an arithmetic number, because the mean of its divisors is an integer number (13519410).

Almost surely, 2^71985986 is an apocalyptic number.

71985986 is a deficient number, since it is larger than the sum of its proper divisors (36169294).

71985986 is a wasteful number, since it uses less digits than its factorization.

71985986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58768.

The product of its digits is 1088640, while the sum is 53.

The square root of 71985986 is about 8484.4555511830. The cubic root of 71985986 is about 415.9897718454.

The spelling of 71985986 in words is "seventy-one million, nine hundred eighty-five thousand, nine hundred eighty-six".