71436240 has 120 divisors (see below), whose sum is σ = 245127168. Its totient is φ = 18635520.

The previous prime is 71436221. The next prime is 71436247. The reversal of 71436240 is 4263417.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71436247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32785 + ... + 34895.

Almost surely, 2^71436240 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 71436240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122563584).

71436240 is an abundant number, since it is smaller than the sum of its proper divisors (173690928).

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

71436240 is a wasteful number, since it uses less digits than its factorization.

71436240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177 (or 2168 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 71436240 is about 8451.9962139130. The cubic root of 71436240 is about 414.9281145146.

Adding to 71436240 its reverse (4263417), we get a palindrome (75699657).

The spelling of 71436240 in words is "seventy-one million, four hundred thirty-six thousand, two hundred forty".