72218742 has 8 divisors (see below), whose sum is σ = 144437496. Its totient is φ = 24072912.

The previous prime is 72218717. The next prime is 72218749. The reversal of 72218742 is 24781227.

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

72218742 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72218749) 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, 6018223 + ... + 6018234.

It is an arithmetic number, because the mean of its divisors is an integer number (18054687).

Almost surely, 2^72218742 is an apocalyptic number.

72218742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72218742 is a wasteful number, since it uses less digits than its factorization.

72218742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12036462.

The product of its digits is 12544, while the sum is 33.

The square root of 72218742 is about 8498.1610952017. The cubic root of 72218742 is about 416.4376365493.

Adding to 72218742 its reverse (24781227), we get a palindrome (96999969).

The spelling of 72218742 in words is "seventy-two million, two hundred eighteen thousand, seven hundred forty-two".