71712709 has 4 divisors (see below), whose sum is σ = 72277504. Its totient is φ = 71147916.

The previous prime is 71712701. The next prime is 71712757. The reversal of 71712709 is 90721717.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90721717 = 31 ⋅2926507.

It is a cyclic number.

It is not a de Polignac number, because 71712709 - 2³ = 71712701 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 (71712701) 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, 282207 + ... + 282460.

It is an arithmetic number, because the mean of its divisors is an integer number (18069376).

Almost surely, 2^71712709 is an apocalyptic number.

It is an amenable number.

71712709 is a deficient number, since it is larger than the sum of its proper divisors (564795).

71712709 is a wasteful number, since it uses less digits than its factorization.

71712709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564794.

The product of its (nonzero) digits is 6174, while the sum is 34.

The square root of 71712709 is about 8468.3356688313. The cubic root of 71712709 is about 415.4627035432.

The spelling of 71712709 in words is "seventy-one million, seven hundred twelve thousand, seven hundred nine".