71736565 has 16 divisors (see below), whose sum is σ = 87892992. Its totient is φ = 56193984.

The previous prime is 71736557. The next prime is 71736569. The reversal of 71736565 is 56563717.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 71736565 - 2³ = 71736557 is a prime.

It is a super-2 number, since 2×71736565² = 10292269515998450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71736569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65452 + ... + 66538.

It is an arithmetic number, because the mean of its divisors is an integer number (5493312).

Almost surely, 2^71736565 is an apocalyptic number.

It is an amenable number.

71736565 is a deficient number, since it is larger than the sum of its proper divisors (16156427).

71736565 is a wasteful number, since it uses less digits than its factorization.

71736565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356.

The product of its digits is 132300, while the sum is 40.

The square root of 71736565 is about 8469.7440929464. The cubic root of 71736565 is about 415.5087678070.

The spelling of 71736565 in words is "seventy-one million, seven hundred thirty-six thousand, five hundred sixty-five".