71957533 has 6 divisors (see below), whose sum is σ = 73671774. Its totient is φ = 70282296.

The previous prime is 71957519. The next prime is 71957537. The reversal of 71957533 is 33575917.

It can be written as a sum of positive squares in only one way, i.e., 47927929 + 24029604 = 6923^2 + 4902^2 .

It is not a de Polignac number, because 71957533 - 2⁹ = 71957021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71957537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17610 + ... + 21307.

It is an arithmetic number, because the mean of its divisors is an integer number (12278629).

Almost surely, 2^71957533 is an apocalyptic number.

It is an amenable number.

71957533 is a deficient number, since it is larger than the sum of its proper divisors (1714241).

71957533 is an equidigital number, since it uses as much as digits as its factorization.

71957533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39003 (or 38960 counting only the distinct ones).

The product of its digits is 99225, while the sum is 40.

The square root of 71957533 is about 8482.7786131668. The cubic root of 71957533 is about 415.9349569320.

The spelling of 71957533 in words is "seventy-one million, nine hundred fifty-seven thousand, five hundred thirty-three".