72726361 has 4 divisors (see below), whose sum is σ = 72744372. Its totient is φ = 72708352.

The previous prime is 72726347. The next prime is 72726371. The reversal of 72726361 is 16362727.

It is a happy number.

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 61544025 + 11182336 = 7845^2 + 3344^2 .

It is a cyclic number.

It is not a de Polignac number, because 72726361 - 2⁷ = 72726233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72726301) 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, 165 + ... + 12061.

It is an arithmetic number, because the mean of its divisors is an integer number (18186093).

Almost surely, 2^72726361 is an apocalyptic number.

It is an amenable number.

72726361 is a deficient number, since it is larger than the sum of its proper divisors (18011).

72726361 is a wasteful number, since it uses less digits than its factorization.

72726361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18010.

The product of its digits is 21168, while the sum is 34.

The square root of 72726361 is about 8527.9751993073. The cubic root of 72726361 is about 417.4110602136.

The spelling of 72726361 in words is "seventy-two million, seven hundred twenty-six thousand, three hundred sixty-one".