71664389 has 8 divisors (see below), whose sum is σ = 75098880. Its totient is φ = 68256496.

The previous prime is 71664379. The next prime is 71664391. The reversal of 71664389 is 98346617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71664389 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 (71664349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1022 + ... + 12015.

It is an arithmetic number, because the mean of its divisors is an integer number (9387360).

Almost surely, 2^71664389 is an apocalyptic number.

It is an amenable number.

71664389 is a deficient number, since it is larger than the sum of its proper divisors (3434491).

71664389 is a wasteful number, since it uses less digits than its factorization.

71664389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13299.

The product of its digits is 217728, while the sum is 44.

The square root of 71664389 is about 8465.4822071752. The cubic root of 71664389 is about 415.3693696991.

The spelling of 71664389 in words is "seventy-one million, six hundred sixty-four thousand, three hundred eighty-nine".