71007709 has 4 divisors (see below), whose sum is σ = 71055100. Its totient is φ = 70960320.

The previous prime is 71007679. The next prime is 71007737. The reversal of 71007709 is 90770017.

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 35640900 + 35366809 = 5970^2 + 5947^2 .

It is a cyclic number.

It is not a de Polignac number, because 71007709 - 2⁷ = 71007581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71007799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21372 + ... + 24469.

It is an arithmetic number, because the mean of its divisors is an integer number (17763775).

Almost surely, 2^71007709 is an apocalyptic number.

It is an amenable number.

71007709 is a deficient number, since it is larger than the sum of its proper divisors (47391).

71007709 is a wasteful number, since it uses less digits than its factorization.

71007709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47390.

The product of its (nonzero) digits is 3087, while the sum is 31.

The square root of 71007709 is about 8426.6072057501. The cubic root of 71007709 is about 414.0967610497.

The spelling of 71007709 in words is "seventy-one million, seven thousand, seven hundred nine".