71606905 has 4 divisors (see below), whose sum is σ = 85928292. Its totient is φ = 57285520.

The previous prime is 71606893. The next prime is 71606917. The reversal of 71606905 is 50960617.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (71606893) and next prime (71606917).

It can be written as a sum of positive squares in 2 ways, for example, as 53056656 + 18550249 = 7284^2 + 4307^2 .

It is not a de Polignac number, because 71606905 - 2⁹ = 71606393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7160686 + ... + 7160695.

It is an arithmetic number, because the mean of its divisors is an integer number (21482073).

Almost surely, 2^71606905 is an apocalyptic number.

It is an amenable number.

71606905 is a deficient number, since it is larger than the sum of its proper divisors (14321387).

71606905 is a wasteful number, since it uses less digits than its factorization.

71606905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14321386.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 71606905 is about 8462.0863266691. The cubic root of 71606905 is about 415.2582802158.

The spelling of 71606905 in words is "seventy-one million, six hundred six thousand, nine hundred five".