72560729 has 4 divisors (see below), whose sum is σ = 72630180. Its totient is φ = 72491280.

The previous prime is 72560713. The next prime is 72560731. The reversal of 72560729 is 92706527.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53655625 + 18905104 = 7325^2 + 4348^2 .

It is a cyclic number.

It is not a de Polignac number, because 72560729 - 2⁴ = 72560713 is a prime.

It is a super-2 number, since 2×72560729² = 10530118786022882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72560692 and 72560701.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33134 + ... + 35255.

It is an arithmetic number, because the mean of its divisors is an integer number (18157545).

Almost surely, 2^72560729 is an apocalyptic number.

It is an amenable number.

72560729 is a deficient number, since it is larger than the sum of its proper divisors (69451).

72560729 is a wasteful number, since it uses less digits than its factorization.

72560729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69450.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 72560729 is about 8518.2585661625. The cubic root of 72560729 is about 417.0939391597.

The spelling of 72560729 in words is "seventy-two million, five hundred sixty thousand, seven hundred twenty-nine".