71664419 has 4 divisors (see below), whose sum is σ = 71818344. Its totient is φ = 71510496.

The previous prime is 71664403. The next prime is 71664421. The reversal of 71664419 is 91446617.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71664419 - 2⁴ = 71664403 is a prime.

It is a super-2 number, since 2×71664419² = 10271577901215122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71664499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76262 + ... + 77195.

It is an arithmetic number, because the mean of its divisors is an integer number (17954586).

Almost surely, 2^71664419 is an apocalyptic number.

71664419 is a deficient number, since it is larger than the sum of its proper divisors (153925).

71664419 is a wasteful number, since it uses less digits than its factorization.

71664419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153924.

The product of its digits is 36288, while the sum is 38.

The square root of 71664419 is about 8465.4839790764. The cubic root of 71664419 is about 415.3694276595.

The spelling of 71664419 in words is "seventy-one million, six hundred sixty-four thousand, four hundred nineteen".