71243805 has 16 divisors (see below), whose sum is σ = 114189120. Its totient is φ = 37930368.

The previous prime is 71243803. The next prime is 71243849. The reversal of 71243805 is 50834217.

It is not a de Polignac number, because 71243805 - 2¹ = 71243803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71243801) 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, 5449 + ... + 13121.

It is an arithmetic number, because the mean of its divisors is an integer number (7136820).

Almost surely, 2^71243805 is an apocalyptic number.

It is an amenable number.

71243805 is a deficient number, since it is larger than the sum of its proper divisors (42945315).

71243805 is a wasteful number, since it uses less digits than its factorization.

71243805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8300.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 71243805 is about 8440.6045399604. The cubic root of 71243805 is about 414.5552015681. Note that the first 3 decimals are identical.

The spelling of 71243805 in words is "seventy-one million, two hundred forty-three thousand, eight hundred five".