71836681 has 4 divisors (see below), whose sum is σ = 82099072. Its totient is φ = 61574292.

The previous prime is 71836673. The next prime is 71836691. The reversal of 71836681 is 18663817.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71836681 - 2³ = 71836673 is a prime.

It is a super-3 number, since 3×71836681³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71836621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5131185 + ... + 5131198.

It is an arithmetic number, because the mean of its divisors is an integer number (20524768).

Almost surely, 2^71836681 is an apocalyptic number.

It is an amenable number.

71836681 is a deficient number, since it is larger than the sum of its proper divisors (10262391).

71836681 is a wasteful number, since it uses less digits than its factorization.

71836681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10262390.

The product of its digits is 48384, while the sum is 40.

The square root of 71836681 is about 8475.6522462876. The cubic root of 71836681 is about 415.7019735025.

The spelling of 71836681 in words is "seventy-one million, eight hundred thirty-six thousand, six hundred eighty-one".