71536140 has 144 divisors (see below), whose sum is σ = 246136800. Its totient is φ = 16671744.

The previous prime is 71536139. The next prime is 71536147. The reversal of 71536140 is 4163517.

It is not an unprimeable number, because it can be changed into a prime (71536147) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43656 + ... + 45264.

Almost surely, 2^71536140 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 71536140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123068400).

71536140 is an abundant number, since it is smaller than the sum of its proper divisors (174600660).

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

71536140 is a wasteful number, since it uses less digits than its factorization.

71536140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656 (or 1651 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 71536140 is about 8457.9039956717. The cubic root of 71536140 is about 415.1214431440.

Adding to 71536140 its reverse (4163517), we get a palindrome (75699657).

The spelling of 71536140 in words is "seventy-one million, five hundred thirty-six thousand, one hundred forty".