72289881 has 16 divisors (see below), whose sum is σ = 107565120. Its totient is φ = 47982240.

The previous prime is 72289873. The next prime is 72289909. The reversal of 72289881 is 18898227.

It is a happy number.

It is not a de Polignac number, because 72289881 - 2³ = 72289873 is a prime.

It is a super-3 number, since 3×72289881³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (72289081) 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 15 ways as a sum of consecutive naturals, for example, 546 + ... + 12036.

It is an arithmetic number, because the mean of its divisors is an integer number (6722820).

Almost surely, 2^72289881 is an apocalyptic number.

It is an amenable number.

72289881 is a deficient number, since it is larger than the sum of its proper divisors (35275239).

72289881 is a wasteful number, since it uses less digits than its factorization.

72289881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11733 (or 11727 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 72289881 is about 8502.3456175340. The cubic root of 72289881 is about 416.5743288362.

The spelling of 72289881 in words is "seventy-two million, two hundred eighty-nine thousand, eight hundred eighty-one".