72240289 has 8 divisors (see below), whose sum is σ = 79888032. Its totient is φ = 64772640.

The previous prime is 72240277. The next prime is 72240347. The reversal of 72240289 is 98204227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72240289 - 2⁵ = 72240257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72241289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44179 + ... + 45784.

It is an arithmetic number, because the mean of its divisors is an integer number (9986004).

Almost surely, 2^72240289 is an apocalyptic number.

It is an amenable number.

72240289 is a deficient number, since it is larger than the sum of its proper divisors (7647743).

72240289 is a wasteful number, since it uses less digits than its factorization.

72240289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90047.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 72240289 is about 8499.4287455099. The cubic root of 72240289 is about 416.4790481888.

The spelling of 72240289 in words is "seventy-two million, two hundred forty thousand, two hundred eighty-nine".