71968309 has 6 divisors (see below), whose sum is σ = 83718294. Its totient is φ = 61687080.

The previous prime is 71968301. The next prime is 71968321. The reversal of 71968309 is 90386917.

It can be written as a sum of positive squares in only one way, i.e., 68807025 + 3161284 = 8295^2 + 1778^2 .

It is not a de Polignac number, because 71968309 - 2³ = 71968301 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 (71968301) 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 5 ways as a sum of consecutive naturals, for example, 734322 + ... + 734419.

It is an arithmetic number, because the mean of its divisors is an integer number (13953049).

Almost surely, 2^71968309 is an apocalyptic number.

It is an amenable number.

71968309 is a deficient number, since it is larger than the sum of its proper divisors (11749985).

71968309 is a wasteful number, since it uses less digits than its factorization.

71968309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468755 (or 1468748 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 71968309 is about 8483.4137586234. The cubic root of 71968309 is about 415.9557186748.

The spelling of 71968309 in words is "seventy-one million, nine hundred sixty-eight thousand, three hundred nine".