71668331 has 6 divisors (see below), whose sum is σ = 83369340. Its totient is φ = 61429956.

The previous prime is 71668307. The next prime is 71668343. The reversal of 71668331 is 13386617.

It is a de Polignac number, because none of the positive numbers 2^k-71668331 is a prime.

It is a super-2 number, since 2×71668331² = 10272699336651122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71668291 and 71668300.

It is not an unprimeable number, because it can be changed into a prime (71668301) 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, 731261 + ... + 731358.

It is an arithmetic number, because the mean of its divisors is an integer number (13894890).

Almost surely, 2^71668331 is an apocalyptic number.

71668331 is a deficient number, since it is larger than the sum of its proper divisors (11701009).

71668331 is a wasteful number, since it uses less digits than its factorization.

71668331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462633 (or 1462626 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 71668331 is about 8465.7150318210. The cubic root of 71668331 is about 415.3769855507.

The spelling of 71668331 in words is "seventy-one million, six hundred sixty-eight thousand, three hundred thirty-one".