71216605 has 8 divisors (see below), whose sum is σ = 88407000. Its totient is φ = 55008576.

The previous prime is 71216603. The next prime is 71216623. The reversal of 71216605 is 50661217.

It can be written as a sum of positive squares in 4 ways, for example, as 5184729 + 66031876 = 2277^2 + 8126^2 .

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 71216605 - 2¹ = 71216603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71216603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245430 + ... + 245719.

It is an arithmetic number, because the mean of its divisors is an integer number (11050875).

Almost surely, 2^71216605 is an apocalyptic number.

It is an amenable number.

71216605 is a deficient number, since it is larger than the sum of its proper divisors (17190395).

71216605 is a wasteful number, since it uses less digits than its factorization.

71216605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491183.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 71216605 is about 8438.9931271450. The cubic root of 71216605 is about 414.5024375100.

The spelling of 71216605 in words is "seventy-one million, two hundred sixteen thousand, six hundred five".