71634565 has 4 divisors (see below), whose sum is σ = 85961484. Its totient is φ = 57307648.

The previous prime is 71634559. The next prime is 71634601. The reversal of 71634565 is 56543617.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8892324 + 62742241 = 2982^2 + 7921^2 .

It is a cyclic number.

It is not a de Polignac number, because 71634565 - 2¹⁵ = 71601797 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, 7163452 + ... + 7163461.

It is an arithmetic number, because the mean of its divisors is an integer number (21490371).

Almost surely, 2^71634565 is an apocalyptic number.

It is an amenable number.

71634565 is a deficient number, since it is larger than the sum of its proper divisors (14326919).

71634565 is a wasteful number, since it uses less digits than its factorization.

71634565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14326918.

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

The square root of 71634565 is about 8463.7205175974. The cubic root of 71634565 is about 415.3117413795.

The spelling of 71634565 in words is "seventy-one million, six hundred thirty-four thousand, five hundred sixty-five".