72851729 has 4 divisors (see below), whose sum is σ = 72919476. Its totient is φ = 72783984.

The previous prime is 72851717. The next prime is 72851743. The reversal of 72851729 is 92715827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92715827 = 677 ⋅136951.

It can be written as a sum of positive squares in 2 ways, for example, as 33814225 + 39037504 = 5815^2 + 6248^2 .

It is a cyclic number.

It is not a de Polignac number, because 72851729 - 2⁸ = 72851473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72851329) by changing a digit.

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, 32234 + ... + 34419.

It is an arithmetic number, because the mean of its divisors is an integer number (18229869).

Almost surely, 2^72851729 is an apocalyptic number.

It is an amenable number.

72851729 is a deficient number, since it is larger than the sum of its proper divisors (67747).

72851729 is a wasteful number, since it uses less digits than its factorization.

72851729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67746.

The product of its digits is 70560, while the sum is 41.

The square root of 72851729 is about 8535.3224309337. The cubic root of 72851729 is about 417.6507713192.

The spelling of 72851729 in words is "seventy-two million, eight hundred fifty-one thousand, seven hundred twenty-nine".