71564365 has 4 divisors (see below), whose sum is σ = 85877244. Its totient is φ = 57251488.

The previous prime is 71564359. The next prime is 71564377. The reversal of 71564365 is 56346517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56346517 = 17 ⋅3314501.

It can be written as a sum of positive squares in 2 ways, for example, as 28281124 + 43283241 = 5318^2 + 6579^2 .

It is a cyclic number.

It is not a de Polignac number, because 71564365 - 2¹¹ = 71562317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7156432 + ... + 7156441.

It is an arithmetic number, because the mean of its divisors is an integer number (21469311).

Almost surely, 2^71564365 is an apocalyptic number.

It is an amenable number.

71564365 is a deficient number, since it is larger than the sum of its proper divisors (14312879).

71564365 is a wasteful number, since it uses less digits than its factorization.

71564365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14312878.

The product of its digits is 75600, while the sum is 37.

The square root of 71564365 is about 8459.5723887204. The cubic root of 71564365 is about 415.1760321582.

The spelling of 71564365 in words is "seventy-one million, five hundred sixty-four thousand, three hundred sixty-five".