71727989 has 4 divisors (see below), whose sum is σ = 72798624. Its totient is φ = 70657356.

The previous prime is 71727979. The next prime is 71728039. The reversal of 71727989 is 98972717.

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-71727989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71727919) 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, 535217 + ... + 535350.

It is an arithmetic number, because the mean of its divisors is an integer number (18199656).

Almost surely, 2^71727989 is an apocalyptic number.

It is an amenable number.

71727989 is a deficient number, since it is larger than the sum of its proper divisors (1070635).

71727989 is a wasteful number, since it uses less digits than its factorization.

71727989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070634.

The product of its digits is 444528, while the sum is 50.

The square root of 71727989 is about 8469.2378051393. The cubic root of 71727989 is about 415.4922093281.

The spelling of 71727989 in words is "seventy-one million, seven hundred twenty-seven thousand, nine hundred eighty-nine".