71941840128 has 54 divisors (see below), whose sum is σ = 207426067394. Its totient is φ = 23980612608.

The previous prime is 71941840057. The next prime is 71941840129. The reversal of 71941840128 is 82104814917.

71941840128 is a `hidden beast` number, since 71 + 9 + 418 + 40 + 128 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55070947584 + 16870892544 = 234672^2 + 129888^2 .

It is a super-2 number, since 2×71941840128² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71941840129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15610075 + ... + 15614682.

Almost surely, 2^71941840128 is an apocalyptic number.

It is an amenable number.

71941840128 is an abundant number, since it is smaller than the sum of its proper divisors (135484227266).

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

71941840128 is a wasteful number, since it uses less digits than its factorization.

71941840128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31224779 (or 31224762 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 71941840128 in words is "seventy-one billion, nine hundred forty-one million, eight hundred forty thousand, one hundred twenty-eight".