71347721 has 8 divisors (see below), whose sum is σ = 71924160. Its totient is φ = 70774128.

The previous prime is 71347693. The next prime is 71347733. The reversal of 71347721 is 12774317.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71347721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71347741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84620 + ... + 85458.

It is an arithmetic number, because the mean of its divisors is an integer number (8990520).

Almost surely, 2^71347721 is an apocalyptic number.

It is an amenable number.

71347721 is a deficient number, since it is larger than the sum of its proper divisors (576439).

71347721 is a wasteful number, since it uses less digits than its factorization.

71347721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423.

The product of its digits is 8232, while the sum is 32.

The square root of 71347721 is about 8446.7580171330. The cubic root of 71347721 is about 414.7566599749.

The spelling of 71347721 in words is "seventy-one million, three hundred forty-seven thousand, seven hundred twenty-one".