71541440 has 56 divisors (see below), whose sum is σ = 180392832. Its totient is φ = 26931200.

The previous prime is 71541419. The next prime is 71541443. The reversal of 71541440 is 4414517.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (71541443) 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, 1136 + ... + 12015.

Almost surely, 2^71541440 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 71541440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90196416).

71541440 is an abundant number, since it is smaller than the sum of its proper divisors (108851392).

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

71541440 is a wasteful number, since it uses less digits than its factorization.

71541440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13185 (or 13175 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 71541440 is about 8458.2173062650. The cubic root of 71541440 is about 415.1316947889.

Adding to 71541440 its reverse (4414517), we get a palindrome (75955957).

The spelling of 71541440 in words is "seventy-one million, five hundred forty-one thousand, four hundred forty".