71945881 has 8 divisors (see below), whose sum is σ = 82872320. Its totient is φ = 61181568.

The previous prime is 71945869. The next prime is 71945891. The reversal of 71945881 is 18854917.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71945881 - 2¹³ = 71937689 is a prime.

It is a super-2 number, since 2×71945881² = 10352419585732322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71945851) by changing a digit.

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, 39576 + ... + 41353.

It is an arithmetic number, because the mean of its divisors is an integer number (10359040).

Almost surely, 2^71945881 is an apocalyptic number.

It is an amenable number.

71945881 is a deficient number, since it is larger than the sum of its proper divisors (10926439).

71945881 is a wasteful number, since it uses less digits than its factorization.

71945881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81063.

The product of its digits is 80640, while the sum is 43.

The square root of 71945881 is about 8482.0917821019. The cubic root of 71945881 is about 415.9125050981.

The spelling of 71945881 in words is "seventy-one million, nine hundred forty-five thousand, eight hundred eighty-one".