72566393 has 4 divisors (see below), whose sum is σ = 73756068. Its totient is φ = 71376720.

The previous prime is 72566383. The next prime is 72566399. The reversal of 72566393 is 39366527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39366527 = 787 ⋅50021.

It can be written as a sum of positive squares in 2 ways, for example, as 20539024 + 52027369 = 4532^2 + 7213^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72566393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72566393.

It is not an unprimeable number, because it can be changed into a prime (72566399) 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, 594746 + ... + 594867.

It is an arithmetic number, because the mean of its divisors is an integer number (18439017).

Almost surely, 2^72566393 is an apocalyptic number.

It is an amenable number.

72566393 is a deficient number, since it is larger than the sum of its proper divisors (1189675).

72566393 is a wasteful number, since it uses less digits than its factorization.

72566393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189674.

The product of its digits is 204120, while the sum is 41.

The square root of 72566393 is about 8518.5910219942. The cubic root of 72566393 is about 417.1047914882.

The spelling of 72566393 in words is "seventy-two million, five hundred sixty-six thousand, three hundred ninety-three".