71922809 has 8 divisors (see below), whose sum is σ = 86523840. Its totient is φ = 58403376.

The previous prime is 71922757. The next prime is 71922811. The reversal of 71922809 is 90822917.

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

It is a cyclic number.

It is not a de Polignac number, because 71922809 - 2⁸ = 71922553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71922839) 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, 270254 + ... + 270519.

It is an arithmetic number, because the mean of its divisors is an integer number (10815480).

Almost surely, 2^71922809 is an apocalyptic number.

It is an amenable number.

71922809 is a deficient number, since it is larger than the sum of its proper divisors (14601031).

71922809 is a wasteful number, since it uses less digits than its factorization.

71922809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540799.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 71922809 is about 8480.7316311743. The cubic root of 71922809 is about 415.8680413099.

It can be divided in two parts, 7192 and 2809, that added together give a palindrome (10001).

The spelling of 71922809 in words is "seventy-one million, nine hundred twenty-two thousand, eight hundred nine".