72727241 has 4 divisors (see below), whose sum is σ = 77005332. Its totient is φ = 68449152.

The previous prime is 72727229. The next prime is 72727243. The reversal of 72727241 is 14272727.

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 32035600 + 40691641 = 5660^2 + 6379^2 .

It is a cyclic number.

It is not a de Polignac number, because 72727241 - 2²⁶ = 5618377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72727198 and 72727207.

It is not an unprimeable number, because it can be changed into a prime (72727243) 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, 2139020 + ... + 2139053.

It is an arithmetic number, because the mean of its divisors is an integer number (19251333).

Almost surely, 2^72727241 is an apocalyptic number.

It is an amenable number.

72727241 is a deficient number, since it is larger than the sum of its proper divisors (4278091).

72727241 is a wasteful number, since it uses less digits than its factorization.

72727241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278090.

The product of its digits is 10976, while the sum is 32.

The square root of 72727241 is about 8528.0267940480. The cubic root of 72727241 is about 417.4127437859.

Adding to 72727241 its reverse (14272727), we get a palindrome (86999968).

The spelling of 72727241 in words is "seventy-two million, seven hundred twenty-seven thousand, two hundred forty-one".