72660529 has 2 divisors, whose sum is σ = 72660530. Its totient is φ = 72660528.

The previous prime is 72660517. The next prime is 72660557. The reversal of 72660529 is 92506627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60093504 + 12567025 = 7752^2 + 3545^2 .

It is an emirp because it is prime and its reverse (92506627) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72660529 is a prime.

It is not a weakly prime, because it can be changed into another prime (72660589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36330264 + 36330265.

It is an arithmetic number, because the mean of its divisors is an integer number (36330265).

Almost surely, 2^72660529 is an apocalyptic number.

It is an amenable number.

72660529 is a deficient number, since it is larger than the sum of its proper divisors (1).

72660529 is an equidigital number, since it uses as much as digits as its factorization.

72660529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 72660529 is about 8524.1145581227. The cubic root of 72660529 is about 417.2850751739.

The spelling of 72660529 in words is "seventy-two million, six hundred sixty thousand, five hundred twenty-nine".