71731868 has 24 divisors (see below), whose sum is σ = 137098080. Its totient is φ = 32639040.

The previous prime is 71731867. The next prime is 71731879. The reversal of 71731868 is 86813717.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71731867) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6023 + ... + 13406.

It is an arithmetic number, because the mean of its divisors is an integer number (5712420).

Almost surely, 2^71731868 is an apocalyptic number.

It is an amenable number.

71731868 is a deficient number, since it is larger than the sum of its proper divisors (65366212).

71731868 is a wasteful number, since it uses less digits than its factorization.

71731868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19517 (or 19515 counting only the distinct ones).

The product of its digits is 56448, while the sum is 41.

The square root of 71731868 is about 8469.4668073026. The cubic root of 71731868 is about 415.4996990367.

The spelling of 71731868 in words is "seventy-one million, seven hundred thirty-one thousand, eight hundred sixty-eight".