71911845 has 24 divisors (see below), whose sum is σ = 125638656. Its totient is φ = 38047968.

The previous prime is 71911841. The next prime is 71911859. The reversal of 71911845 is 54811917.

It is not a de Polignac number, because 71911845 - 2² = 71911841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71911841) 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 23 ways as a sum of consecutive naturals, for example, 577 + ... + 12006.

It is an arithmetic number, because the mean of its divisors is an integer number (5234944).

Almost surely, 2^71911845 is an apocalyptic number.

It is an amenable number.

71911845 is a deficient number, since it is larger than the sum of its proper divisors (53726811).

71911845 is a wasteful number, since it uses less digits than its factorization.

71911845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12721 (or 12718 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 71911845 is about 8480.0852000437. The cubic root of 71911845 is about 415.8469084269.

The spelling of 71911845 in words is "seventy-one million, nine hundred eleven thousand, eight hundred forty-five".