72737765 has 4 divisors (see below), whose sum is σ = 87285324. Its totient is φ = 58190208.

The previous prime is 72737759. The next prime is 72737767. The reversal of 72737765 is 56773727.

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 20349121 + 52388644 = 4511^2 + 7238^2 .

It is a cyclic number.

It is not a de Polignac number, because 72737765 - 2⁶ = 72737701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72737767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7273772 + ... + 7273781.

It is an arithmetic number, because the mean of its divisors is an integer number (21821331).

Almost surely, 2^72737765 is an apocalyptic number.

It is an amenable number.

72737765 is a deficient number, since it is larger than the sum of its proper divisors (14547559).

72737765 is a wasteful number, since it uses less digits than its factorization.

72737765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14547558.

The product of its digits is 432180, while the sum is 44.

The square root of 72737765 is about 8528.6437960557. The cubic root of 72737765 is about 417.4328767273.

The spelling of 72737765 in words is "seventy-two million, seven hundred thirty-seven thousand, seven hundred sixty-five".