72423222 has 16 divisors (see below), whose sum is σ = 144986112. Its totient is φ = 24117800.

The previous prime is 72423217. The next prime is 72423229. The reversal of 72423222 is 22232427.

It is a happy number.

It is a super-2 number, since 2×72423222² = 10490246169722568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72423192 and 72423201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72423229) 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, 1663 + ... + 12149.

It is an arithmetic number, because the mean of its divisors is an integer number (9061632).

Almost surely, 2^72423222 is an apocalyptic number.

72423222 is an abundant number, since it is smaller than the sum of its proper divisors (72562890).

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

72423222 is a wasteful number, since it uses less digits than its factorization.

72423222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11643.

The product of its digits is 2688, while the sum is 24.

The square root of 72423222 is about 8510.1834292805. The cubic root of 72423222 is about 416.8302997475.

Adding to 72423222 its reverse (22232427), we get a palindrome (94655649).

The spelling of 72423222 in words is "seventy-two million, four hundred twenty-three thousand, two hundred twenty-two".