72705265 has 4 divisors (see below), whose sum is σ = 87246324. Its totient is φ = 58164208.

The previous prime is 72705263. The next prime is 72705293. The reversal of 72705265 is 56250727.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56250727 = 13 ⋅4326979.

It can be written as a sum of positive squares in 2 ways, for example, as 53450721 + 19254544 = 7311^2 + 4388^2 .

It is a cyclic number.

It is not a de Polignac number, because 72705265 - 2¹ = 72705263 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 72705265.

It is not an unprimeable number, because it can be changed into a prime (72705263) 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, 7270522 + ... + 7270531.

It is an arithmetic number, because the mean of its divisors is an integer number (21811581).

Almost surely, 2^72705265 is an apocalyptic number.

It is an amenable number.

72705265 is a deficient number, since it is larger than the sum of its proper divisors (14541059).

72705265 is a wasteful number, since it uses less digits than its factorization.

72705265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14541058.

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 72705265 is about 8526.7382392096. The cubic root of 72705265 is about 417.3706963291.

The spelling of 72705265 in words is "seventy-two million, seven hundred five thousand, two hundred sixty-five".