72775565 has 16 divisors (see below), whose sum is σ = 93253248. Its totient is φ = 54390336.

The previous prime is 72775561. The next prime is 72775579. The reversal of 72775565 is 56557727.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 72775565 - 2² = 72775561 is a prime.

It is a super-2 number, since 2×72775565² = 10592565722138450, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72775561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2414 + ... + 12303.

It is an arithmetic number, because the mean of its divisors is an integer number (5828328).

Almost surely, 2^72775565 is an apocalyptic number.

It is an amenable number.

72775565 is a deficient number, since it is larger than the sum of its proper divisors (20477683).

72775565 is a wasteful number, since it uses less digits than its factorization.

72775565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14788.

The product of its digits is 514500, while the sum is 44.

The square root of 72775565 is about 8530.8595698206. The cubic root of 72775565 is about 417.5051740189.

The spelling of 72775565 in words is "seventy-two million, seven hundred seventy-five thousand, five hundred sixty-five".