71720986 has 8 divisors (see below), whose sum is σ = 107832384. Its totient is φ = 35776860.

The previous prime is 71720959. The next prime is 71721071. The reversal of 71720986 is 68902717.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40740 + ... + 42463.

It is an arithmetic number, because the mean of its divisors is an integer number (13479048).

Almost surely, 2^71720986 is an apocalyptic number.

71720986 is a deficient number, since it is larger than the sum of its proper divisors (36111398).

71720986 is a wasteful number, since it uses less digits than its factorization.

71720986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83636.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 71720986 is about 8468.8243576071. The cubic root of 71720986 is about 415.4786870072.

The spelling of 71720986 in words is "seventy-one million, seven hundred twenty thousand, nine hundred eighty-six".