71728643 has 8 divisors (see below), whose sum is σ = 82401888. Its totient is φ = 61161984.

The previous prime is 71728633. The next prime is 71728691. The reversal of 71728643 is 34682717.

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

It is a cyclic number.

It is not a de Polignac number, because 71728643 - 2⁸ = 71728387 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71728597 and 71728606.

It is not an unprimeable number, because it can be changed into a prime (71728633) 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, 25196 + ... + 27897.

It is an arithmetic number, because the mean of its divisors is an integer number (10300236).

Almost surely, 2^71728643 is an apocalyptic number.

71728643 is a deficient number, since it is larger than the sum of its proper divisors (10673245).

71728643 is a wasteful number, since it uses less digits than its factorization.

71728643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53293.

The product of its digits is 56448, while the sum is 38.

The square root of 71728643 is about 8469.2764153734. The cubic root of 71728643 is about 415.4934721130.

The spelling of 71728643 in words is "seventy-one million, seven hundred twenty-eight thousand, six hundred forty-three".