71008645 has 4 divisors (see below), whose sum is σ = 85210380. Its totient is φ = 56806912.

The previous prime is 71008601. The next prime is 71008657. The reversal of 71008645 is 54680017.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35796289 + 35212356 = 5983^2 + 5934^2 .

It is a cyclic number.

It is not a de Polignac number, because 71008645 - 2¹¹ = 71006597 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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, 7100860 + ... + 7100869.

It is an arithmetic number, because the mean of its divisors is an integer number (21302595).

Almost surely, 2^71008645 is an apocalyptic number.

It is an amenable number.

71008645 is a deficient number, since it is larger than the sum of its proper divisors (14201735).

71008645 is a wasteful number, since it uses less digits than its factorization.

71008645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14201734.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 71008645 is about 8426.6627439337. The cubic root of 71008645 is about 414.0985805370.

The spelling of 71008645 in words is "seventy-one million, eight thousand, six hundred forty-five".