72831565 has 8 divisors (see below), whose sum is σ = 87446520. Its totient is φ = 58232832.

The previous prime is 72831533. The next prime is 72831569. The reversal of 72831565 is 56513827.

It can be written as a sum of positive squares in 4 ways, for example, as 3575881 + 69255684 = 1891^2 + 8322^2 .

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 72831565 - 2⁵ = 72831533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72831569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10737 + ... + 16153.

It is an arithmetic number, because the mean of its divisors is an integer number (10930815).

Almost surely, 2^72831565 is an apocalyptic number.

It is an amenable number.

72831565 is a deficient number, since it is larger than the sum of its proper divisors (14614955).

72831565 is a wasteful number, since it uses less digits than its factorization.

72831565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8111.

The product of its digits is 50400, while the sum is 37.

The square root of 72831565 is about 8534.1411401500. The cubic root of 72831565 is about 417.6122351153.

The spelling of 72831565 in words is "seventy-two million, eight hundred thirty-one thousand, five hundred sixty-five".