71708689 has 4 divisors (see below), whose sum is σ = 77224756. Its totient is φ = 66192624.

The previous prime is 71708647. The next prime is 71708723. The reversal of 71708689 is 98680717.

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 40259025 + 31449664 = 6345^2 + 5608^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71708689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71708639) 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, 2758014 + ... + 2758039.

It is an arithmetic number, because the mean of its divisors is an integer number (19306189).

Almost surely, 2^71708689 is an apocalyptic number.

It is an amenable number.

71708689 is a deficient number, since it is larger than the sum of its proper divisors (5516067).

71708689 is a wasteful number, since it uses less digits than its factorization.

71708689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5516066.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 71708689 is about 8468.0983107189. The cubic root of 71708689 is about 415.4549401993.

The spelling of 71708689 in words is "seventy-one million, seven hundred eight thousand, six hundred eighty-nine".