72218339 has 8 divisors (see below), whose sum is σ = 74349888. Its totient is φ = 70096320.

The previous prime is 72218309. The next prime is 72218353. The reversal of 72218339 is 93381227.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72218339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72218299 and 72218308.

It is not an unprimeable number, because it can be changed into a prime (72218309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14774 + ... + 19044.

It is an arithmetic number, because the mean of its divisors is an integer number (9293736).

Almost surely, 2^72218339 is an apocalyptic number.

72218339 is a deficient number, since it is larger than the sum of its proper divisors (2131549).

72218339 is a wasteful number, since it uses less digits than its factorization.

72218339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765.

The product of its digits is 18144, while the sum is 35.

The square root of 72218339 is about 8498.1373841566. The cubic root of 72218339 is about 416.4368619366.

The spelling of 72218339 in words is "seventy-two million, two hundred eighteen thousand, three hundred thirty-nine".