71945216 has 44 divisors (see below), whose sum is σ = 164382288. Its totient is φ = 30830592.

The previous prime is 71945213. The next prime is 71945227. The reversal of 71945216 is 61254917.

It is a super-2 number, since 2×71945216² = 10352228210573312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71945213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2150 + ... + 12186.

Almost surely, 2^71945216 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 71945216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82191144).

71945216 is an abundant number, since it is smaller than the sum of its proper divisors (92437072).

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

71945216 is a wasteful number, since it uses less digits than its factorization.

71945216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10064 (or 10046 counting only the distinct ones).

The product of its digits is 15120, while the sum is 35.

The square root of 71945216 is about 8482.0525817752. The cubic root of 71945216 is about 415.9112236596.

The spelling of 71945216 in words is "seventy-one million, nine hundred forty-five thousand, two hundred sixteen".