72447289 has 4 divisors (see below), whose sum is σ = 72474100. Its totient is φ = 72420480.

The previous prime is 72447283. The next prime is 72447299. The reversal of 72447289 is 98274427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98274427 = 1949 ⋅50423.

It can be written as a sum of positive squares in 2 ways, for example, as 22278400 + 50168889 = 4720^2 + 7083^2 .

It is a cyclic number.

It is not a de Polignac number, because 72447289 - 2¹⁵ = 72414521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72447283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8832 + ... + 14929.

It is an arithmetic number, because the mean of its divisors is an integer number (18118525).

Almost surely, 2^72447289 is an apocalyptic number.

It is an amenable number.

72447289 is a deficient number, since it is larger than the sum of its proper divisors (26811).

72447289 is a wasteful number, since it uses less digits than its factorization.

72447289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26810.

The product of its digits is 225792, while the sum is 43.

The square root of 72447289 is about 8511.5973236520. The cubic root of 72447289 is about 416.8764670012.

The spelling of 72447289 in words is "seventy-two million, four hundred forty-seven thousand, two hundred eighty-nine".