71843817852 has 72 divisors (see below), whose sum is σ = 186587746800. Its totient is φ = 23299273728.

The previous prime is 71843817839. The next prime is 71843817853. The reversal of 71843817852 is 25871834817.

71843817852 is a `hidden beast` number, since 7 + 184 + 381 + 7 + 85 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71843817853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31674 + ... + 380382.

Almost surely, 2^71843817852 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 71843817852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93293873400).

71843817852 is an abundant number, since it is smaller than the sum of its proper divisors (114743928948).

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

71843817852 is a wasteful number, since it uses less digits than its factorization.

71843817852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348875 (or 348870 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The spelling of 71843817852 in words is "seventy-one billion, eight hundred forty-three million, eight hundred seventeen thousand, eight hundred fifty-two".