71244 has 18 divisors (see below), whose sum is σ = 180180. Its totient is φ = 23736.

The previous prime is 71237. The next prime is 71249. The reversal of 71244 is 44217.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (71249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 954 + ... + 1025.

It is an arithmetic number, because the mean of its divisors is an integer number (10010).

2⁷¹²⁴⁴ is an apocalyptic number.

It is an amenable number.

71244 is an abundant number, since it is smaller than the sum of its proper divisors (108936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71244 is a wasteful number, since it uses less digits than its factorization.

71244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989 (or 1984 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 71244 is about 266.9157170344. The cubic root of 71244 is about 41.4555579791.

The spelling of 71244 in words is "seventy-one thousand, two hundred forty-four", and thus it is an iban number.