71640593 has 4 divisors (see below), whose sum is σ = 71662080. Its totient is φ = 71619108.

The previous prime is 71640587. The next prime is 71640629. The reversal of 71640593 is 39504617.

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: 39504617 = 17 ⋅2323801.

It is a cyclic number.

It is not a de Polignac number, because 71640593 - 2¹⁰ = 71639569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71640523) 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, 4553 + ... + 12806.

It is an arithmetic number, because the mean of its divisors is an integer number (17915520).

Almost surely, 2^71640593 is an apocalyptic number.

It is an amenable number.

71640593 is a deficient number, since it is larger than the sum of its proper divisors (21487).

71640593 is a wasteful number, since it uses less digits than its factorization.

71640593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21486.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 71640593 is about 8464.0766182733. The cubic root of 71640593 is about 415.3233904531.

The spelling of 71640593 in words is "seventy-one million, six hundred forty thousand, five hundred ninety-three".