71043840 has 216 divisors, whose sum is σ = 281238048. Its totient is φ = 16220160.

The previous prime is 71043779. The next prime is 71043859. The reversal of 71043840 is 4834017.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80200 + ... + 81080.

It is an arithmetic number, because the mean of its divisors is an integer number (1302028).

Almost surely, 2^71043840 is an apocalyptic number.

71043840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71043840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140619024).

71043840 is an abundant number, since it is smaller than the sum of its proper divisors (210194208).

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

71043840 is a wasteful number, since it uses less digits than its factorization.

71043840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915 (or 898 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 71043840 is about 8428.7507971229. The cubic root of 71043840 is about 414.1669843786.

Adding to 71043840 its reverse (4834017), we get a palindrome (75877857).

The spelling of 71043840 in words is "seventy-one million, forty-three thousand, eight hundred forty".