72218243 has 8 divisors (see below), whose sum is σ = 73466016. Its totient is φ = 70977600.

The previous prime is 72218233. The next prime is 72218269. The reversal of 72218243 is 34281227.

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-72218243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72218203) 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, 21113 + ... + 24293.

It is an arithmetic number, because the mean of its divisors is an integer number (9183252).

Almost surely, 2^72218243 is an apocalyptic number.

72218243 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

72218243 is a deficient number, since it is larger than the sum of its proper divisors (1247773).

72218243 is a wasteful number, since it uses less digits than its factorization.

72218243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565.

The product of its digits is 5376, while the sum is 29.

The square root of 72218243 is about 8498.1317358582. The cubic root of 72218243 is about 416.4366774130.

The spelling of 72218243 in words is "seventy-two million, two hundred eighteen thousand, two hundred forty-three".