71943312 has 80 divisors (see below), whose sum is σ = 219287552. Its totient is φ = 19889280.

The previous prime is 71943283. The next prime is 71943317. The reversal of 71943312 is 21334917.

It is a self number, because there is not a number n which added to its sum of digits gives 71943312.

It is not an unprimeable number, because it can be changed into a prime (71943317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6963 + ... + 13869.

Almost surely, 2^71943312 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 71943312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109643776).

71943312 is an abundant number, since it is smaller than the sum of its proper divisors (147344240).

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

71943312 is a wasteful number, since it uses less digits than its factorization.

71943312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6956 (or 6950 counting only the distinct ones).

The product of its digits is 4536, while the sum is 30.

The square root of 71943312 is about 8481.9403440486. The cubic root of 71943312 is about 415.9075546552.

The spelling of 71943312 in words is "seventy-one million, nine hundred forty-three thousand, three hundred twelve".