72144422 has 32 divisors (see below), whose sum is σ = 129600000. Its totient is φ = 29449728.

The previous prime is 72144421. The next prime is 72144427. The reversal of 72144422 is 22444127.

It is a junction number, because it is equal to n+sod(n) for n = 72144391 and 72144400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72144421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144329 + ... + 144827.

It is an arithmetic number, because the mean of its divisors is an integer number (4050000).

Almost surely, 2^72144422 is an apocalyptic number.

72144422 is a deficient number, since it is larger than the sum of its proper divisors (57455578).

72144422 is a wasteful number, since it uses less digits than its factorization.

72144422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980.

The product of its digits is 3584, while the sum is 26.

The square root of 72144422 is about 8493.7872589323. The cubic root of 72144422 is about 416.2947361190.

Adding to 72144422 its reverse (22444127), we get a palindrome (94588549).

The spelling of 72144422 in words is "seventy-two million, one hundred forty-four thousand, four hundred twenty-two".