71365643 has 8 divisors (see below), whose sum is σ = 75881520. Its totient is φ = 66885120.

The previous prime is 71365631. The next prime is 71365667. The reversal of 71365643 is 34656317.

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 71365643 - 2¹⁸ = 71103499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71365673) 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, 4613 + ... + 12806.

It is an arithmetic number, because the mean of its divisors is an integer number (9485190).

Almost surely, 2^71365643 is an apocalyptic number.

71365643 is a deficient number, since it is larger than the sum of its proper divisors (4515877).

71365643 is a wasteful number, since it uses less digits than its factorization.

71365643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17677.

The product of its digits is 45360, while the sum is 35.

The square root of 71365643 is about 8447.8188309172. The cubic root of 71365643 is about 414.7913849642.

The spelling of 71365643 in words is "seventy-one million, three hundred sixty-five thousand, six hundred forty-three".