72107722 has 4 divisors (see below), whose sum is σ = 108161586. Its totient is φ = 36053860.

The previous prime is 72107699. The next prime is 72107723. The reversal of 72107722 is 22770127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22770127 = 3203 ⋅7109.

It can be written as a sum of positive squares in only one way, i.e., 69739201 + 2368521 = 8351^2 + 1539^2 .

It is not an unprimeable number, because it can be changed into a prime (72107723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18026929 + ... + 18026932.

Almost surely, 2^72107722 is an apocalyptic number.

72107722 is a deficient number, since it is larger than the sum of its proper divisors (36053864).

72107722 is a wasteful number, since it uses less digits than its factorization.

72107722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36053863.

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 72107722 is about 8491.6265815214. The cubic root of 72107722 is about 416.2241341802.

Adding to 72107722 its reverse (22770127), we get a palindrome (94877849).

The spelling of 72107722 in words is "seventy-two million, one hundred seven thousand, seven hundred twenty-two".