71668831 has 16 divisors (see below), whose sum is σ = 81718560. Its totient is φ = 62375040.

The previous prime is 71668829. The next prime is 71668841. The reversal of 71668831 is 13886617.

It is not a de Polignac number, because 71668831 - 2¹ = 71668829 is a prime.

It is a super-2 number, since 2×71668831² = 10272842673813122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71668801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14001 + ... + 18421.

It is an arithmetic number, because the mean of its divisors is an integer number (5107410).

Almost surely, 2^71668831 is an apocalyptic number.

71668831 is a deficient number, since it is larger than the sum of its proper divisors (10049729).

71668831 is a wasteful number, since it uses less digits than its factorization.

71668831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4506.

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

The square root of 71668831 is about 8465.7445626478. The cubic root of 71668831 is about 415.3779515190.

The spelling of 71668831 in words is "seventy-one million, six hundred sixty-eight thousand, eight hundred thirty-one".