72328717 has 4 divisors (see below), whose sum is σ = 72351580. Its totient is φ = 72305856.

The previous prime is 72328703. The next prime is 72328733. The reversal of 72328717 is 71782327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71782327 = 89 ⋅806543.

It can be written as a sum of positive squares in 2 ways, for example, as 49154121 + 23174596 = 7011^2 + 4814^2 .

It is a cyclic number.

It is not a de Polignac number, because 72328717 - 2⁷ = 72328589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72328757) 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 3 ways as a sum of consecutive naturals, for example, 5742 + ... + 13327.

It is an arithmetic number, because the mean of its divisors is an integer number (18087895).

Almost surely, 2^72328717 is an apocalyptic number.

It is an amenable number.

72328717 is a deficient number, since it is larger than the sum of its proper divisors (22863).

72328717 is a wasteful number, since it uses less digits than its factorization.

72328717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22862.

The product of its digits is 32928, while the sum is 37.

The square root of 72328717 is about 8504.6291512329. The cubic root of 72328717 is about 416.6489136614.

The spelling of 72328717 in words is "seventy-two million, three hundred twenty-eight thousand, seven hundred seventeen".