71672709 has 8 divisors (see below), whose sum is σ = 96251680. Its totient is φ = 47437776.

The previous prime is 71672687. The next prime is 71672729. The reversal of 71672709 is 90727617.

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

It is not a de Polignac number, because 71672709 - 2⁸ = 71672453 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 (71672729) 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, 85522 + ... + 86355.

It is an arithmetic number, because the mean of its divisors is an integer number (12031460).

Almost surely, 2^71672709 is an apocalyptic number.

It is an amenable number.

71672709 is a deficient number, since it is larger than the sum of its proper divisors (24578971).

71672709 is a wasteful number, since it uses less digits than its factorization.

71672709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172019.

The product of its (nonzero) digits is 37044, while the sum is 39.

The square root of 71672709 is about 8465.9736002423. The cubic root of 71672709 is about 415.3854434166.

The spelling of 71672709 in words is "seventy-one million, six hundred seventy-two thousand, seven hundred nine".