71564765 has 8 divisors (see below), whose sum is σ = 85934520. Its totient is φ = 57213952.

The previous prime is 71564743. The next prime is 71564783. The reversal of 71564765 is 56746517.

It can be written as a sum of positive squares in 4 ways, for example, as 111556 + 71453209 = 334^2 + 8453^2 .

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 71564765 - 2²² = 67370461 is a prime.

It is a super-3 number, since 3×71564765³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5657 + ... + 13233.

It is an arithmetic number, because the mean of its divisors is an integer number (10741815).

Almost surely, 2^71564765 is an apocalyptic number.

It is an amenable number.

71564765 is a deficient number, since it is larger than the sum of its proper divisors (14369755).

71564765 is a wasteful number, since it uses less digits than its factorization.

71564765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9471.

The product of its digits is 176400, while the sum is 41.

The square root of 71564765 is about 8459.5960305442. The cubic root of 71564765 is about 415.1768056814.

The spelling of 71564765 in words is "seventy-one million, five hundred sixty-four thousand, seven hundred sixty-five".