72443242 has 4 divisors (see below), whose sum is σ = 108664866. Its totient is φ = 36221620.

The previous prime is 72443227. The next prime is 72443251. The reversal of 72443242 is 24234427.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 58537801 + 13905441 = 7651^2 + 3729^2 .

It is a super-2 number, since 2×72443242² = 10496046622941128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72443242.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18110809 + ... + 18110812.

Almost surely, 2^72443242 is an apocalyptic number.

72443242 is a deficient number, since it is larger than the sum of its proper divisors (36221624).

72443242 is a wasteful number, since it uses less digits than its factorization.

72443242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36221623.

The product of its digits is 10752, while the sum is 28.

The square root of 72443242 is about 8511.3595858711. The cubic root of 72443242 is about 416.8687044357.

Adding to 72443242 its reverse (24234427), we get a palindrome (96677669).

The spelling of 72443242 in words is "seventy-two million, four hundred forty-three thousand, two hundred forty-two".