71989836 has 24 divisors (see below), whose sum is σ = 168161280. Its totient is φ = 23970192.

The previous prime is 71989831. The next prime is 71989837. The reversal of 71989836 is 63898917.

It is not an unprimeable number, because it can be changed into a prime (71989831) 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, 10285 + ... + 15803.

It is an arithmetic number, because the mean of its divisors is an integer number (7006720).

Almost surely, 2^71989836 is an apocalyptic number.

It is an amenable number.

71989836 is an abundant number, since it is smaller than the sum of its proper divisors (96171444).

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

71989836 is a wasteful number, since it uses less digits than its factorization.

71989836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6613 (or 6611 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The square root of 71989836 is about 8484.6824336565. The cubic root of 71989836 is about 415.9971877892.

The spelling of 71989836 in words is "seventy-one million, nine hundred eighty-nine thousand, eight hundred thirty-six".