71861709 has 8 divisors (see below), whose sum is σ = 96051520. Its totient is φ = 47789856.

The previous prime is 71861707. The next prime is 71861717. The reversal of 71861709 is 90716817.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71861709 - 2¹ = 71861707 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 (71861707) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28057 + ... + 30510.

It is an arithmetic number, because the mean of its divisors is an integer number (12006440).

Almost surely, 2^71861709 is an apocalyptic number.

It is an amenable number.

71861709 is a deficient number, since it is larger than the sum of its proper divisors (24189811).

71861709 is a wasteful number, since it uses less digits than its factorization.

71861709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58979.

The product of its (nonzero) digits is 21168, while the sum is 39.

The square root of 71861709 is about 8477.1285822500. The cubic root of 71861709 is about 415.7502449464.

The spelling of 71861709 in words is "seventy-one million, eight hundred sixty-one thousand, seven hundred nine".