71708939 has 4 divisors (see below), whose sum is σ = 72379224. Its totient is φ = 71038656.

The previous prime is 71708933. The next prime is 71708953. The reversal of 71708939 is 93980717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93980717 = 1621 ⋅57977.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71708939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71708939.

It is not an unprimeable number, because it can be changed into a prime (71708933) 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, 334982 + ... + 335195.

It is an arithmetic number, because the mean of its divisors is an integer number (18094806).

Almost surely, 2^71708939 is an apocalyptic number.

71708939 is a deficient number, since it is larger than the sum of its proper divisors (670285).

71708939 is a wasteful number, since it uses less digits than its factorization.

71708939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670284.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 71708939 is about 8468.1130719895. The cubic root of 71708939 is about 415.4554230028.

The spelling of 71708939 in words is "seventy-one million, seven hundred eight thousand, nine hundred thirty-nine".