71664331 has 4 divisors (see below), whose sum is σ = 73189152. Its totient is φ = 70139512.

The previous prime is 71664323. The next prime is 71664349. The reversal of 71664331 is 13346617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13346617 = 61 ⋅218797.

It is a cyclic number.

It is not a de Polignac number, because 71664331 - 2³ = 71664323 is a prime.

It is a super-2 number, since 2×71664331² = 10271552675355122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71664293 and 71664302.

It is not an unprimeable number, because it can be changed into a prime (71664311) 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 3 ways as a sum of consecutive naturals, for example, 762340 + ... + 762433.

It is an arithmetic number, because the mean of its divisors is an integer number (18297288).

Almost surely, 2^71664331 is an apocalyptic number.

71664331 is a deficient number, since it is larger than the sum of its proper divisors (1524821).

71664331 is a wasteful number, since it uses less digits than its factorization.

71664331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524820.

The product of its digits is 9072, while the sum is 31.

The square root of 71664331 is about 8465.4787814984. The cubic root of 71664331 is about 415.3692576424.

The spelling of 71664331 in words is "seventy-one million, six hundred sixty-four thousand, three hundred thirty-one".