71722289 has 4 divisors (see below), whose sum is σ = 71763456. Its totient is φ = 71681124.

The previous prime is 71722271. The next prime is 71722297. The reversal of 71722289 is 98222717.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71722289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71727289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17849 + ... + 21494.

It is an arithmetic number, because the mean of its divisors is an integer number (17940864).

Almost surely, 2^71722289 is an apocalyptic number.

It is an amenable number.

71722289 is a deficient number, since it is larger than the sum of its proper divisors (41167).

71722289 is a wasteful number, since it uses less digits than its factorization.

71722289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41166.

The product of its digits is 28224, while the sum is 38.

The square root of 71722289 is about 8468.9012864716. The cubic root of 71722289 is about 415.4812030790.

The spelling of 71722289 in words is "seventy-one million, seven hundred twenty-two thousand, two hundred eighty-nine".