71945944 has 32 divisors (see below), whose sum is σ = 155623680. Its totient is φ = 30543264.

The previous prime is 71945927. The next prime is 71945999. The reversal of 71945944 is 44954917.

It is a super-2 number, since 2×71945944² = 10352437716102272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71945944.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12 + ... + 11995.

It is an arithmetic number, because the mean of its divisors is an integer number (4863240).

Almost surely, 2^71945944 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 71945944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77811840).

71945944 is an abundant number, since it is smaller than the sum of its proper divisors (83677736).

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

71945944 is a wasteful number, since it uses less digits than its factorization.

71945944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12127 (or 12123 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The square root of 71945944 is about 8482.0954958076. The cubic root of 71945944 is about 415.9126264972.

The spelling of 71945944 in words is "seventy-one million, nine hundred forty-five thousand, nine hundred forty-four".