71644223 has 6 divisors (see below), whose sum is σ = 83341296. Its totient is φ = 61409292.

The previous prime is 71644217. The next prime is 71644259. The reversal of 71644223 is 32244617.

It is not a de Polignac number, because 71644223 - 2⁴ = 71644207 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 (71644423) 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 5 ways as a sum of consecutive naturals, for example, 731015 + ... + 731112.

It is an arithmetic number, because the mean of its divisors is an integer number (13890216).

Almost surely, 2^71644223 is an apocalyptic number.

71644223 is a deficient number, since it is larger than the sum of its proper divisors (11697073).

71644223 is a wasteful number, since it uses less digits than its factorization.

71644223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1462141 (or 1462134 counting only the distinct ones).

The product of its digits is 8064, while the sum is 29.

The square root of 71644223 is about 8464.2910512340. The cubic root of 71644223 is about 415.3304050909.

The spelling of 71644223 in words is "seventy-one million, six hundred forty-four thousand, two hundred twenty-three".