71989181500 has 24 divisors (see below), whose sum is σ = 157224373488. Its totient is φ = 28795672400.

The previous prime is 71989181489. The next prime is 71989181507. The reversal of 71989181500 is 518198917.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71989181507) 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, 71988682 + ... + 71989681.

It is an arithmetic number, because the mean of its divisors is an integer number (6551015562).

Almost surely, 2^71989181500 is an apocalyptic number.

It is an amenable number.

71989181500 is an abundant number, since it is smaller than the sum of its proper divisors (85235191988).

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

71989181500 is a wasteful number, since it uses less digits than its factorization.

71989181500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143978382 (or 143978370 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 49.

The spelling of 71989181500 in words is "seventy-one billion, nine hundred eighty-nine million, one hundred eighty-one thousand, five hundred".