71240 has 32 divisors (see below), whose sum is σ = 173880. Its totient is φ = 26112.

The previous prime is 71237. The next prime is 71249. The reversal of 71240 is 4217.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 47524 + 23716 = 218^2 + 154^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71249) 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, 452 + ... + 588.

2⁷¹²⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86940).

71240 is an abundant number, since it is smaller than the sum of its proper divisors (102640).

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

71240 is a wasteful number, since it uses less digits than its factorization.

71240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 71240 is about 266.9082239273. The cubic root of 71240 is about 41.4547821228.

Adding to 71240 its reverse (4217), we get a palindrome (75457).

The spelling of 71240 in words is "seventy-one thousand, two hundred forty", and thus it is an iban number.