71840686 has 8 divisors (see below), whose sum is σ = 107911440. Its totient is φ = 35870208.

The previous prime is 71840677. The next prime is 71840693. The reversal of 71840686 is 68604817.

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

It is a super-2 number, since 2×71840686² = 10322168329901192, which 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 3 ways as a sum of consecutive naturals, for example, 23251 + ... + 26158.

It is an arithmetic number, because the mean of its divisors is an integer number (13488930).

Almost surely, 2^71840686 is an apocalyptic number.

71840686 is a deficient number, since it is larger than the sum of its proper divisors (36070754).

71840686 is a wasteful number, since it uses less digits than its factorization.

71840686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50138.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 71840686 is about 8475.8885079973. Note that the first 3 decimals coincide. The cubic root of 71840686 is about 415.7096986899.

The spelling of 71840686 in words is "seventy-one million, eight hundred forty thousand, six hundred eighty-six".