71644 has 6 divisors (see below), whose sum is σ = 125384. Its totient is φ = 35820.

The previous prime is 71633. The next prime is 71647. The reversal of 71644 is 44617.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8952 + ... + 8959.

2⁷¹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

71644 is a deficient number, since it is larger than the sum of its proper divisors (53740).

71644 is a wasteful number, since it uses less digits than its factorization.

71644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17915 (or 17913 counting only the distinct ones).

The product of its digits is 672, while the sum is 22.

The square root of 71644 is about 267.6639684380. The cubic root of 71644 is about 41.5329974171.

The spelling of 71644 in words is "seventy-one thousand, six hundred forty-four".