71685081 has 40 divisors (see below), whose sum is σ = 121425920. Its totient is φ = 41780448.

The previous prime is 71685077. The next prime is 71685083. The reversal of 71685081 is 18058617.

It is not a de Polignac number, because 71685081 - 2² = 71685077 is a prime.

It is a super-2 number, since 2×71685081² = 10277501675953122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71685083) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18216 + ... + 21798.

It is an arithmetic number, because the mean of its divisors is an integer number (3035648).

Almost surely, 2^71685081 is an apocalyptic number.

It is an amenable number.

71685081 is a deficient number, since it is larger than the sum of its proper divisors (49740839).

71685081 is a wasteful number, since it uses less digits than its factorization.

71685081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3627 (or 3618 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 71685081 is about 8466.7042584467. The cubic root of 71685081 is about 415.4093430436.

The spelling of 71685081 in words is "seventy-one million, six hundred eighty-five thousand, eighty-one".