72272272 has 20 divisors (see below), whose sum is σ = 141603660. Its totient is φ = 35729408.

The previous prime is 72272269. The next prime is 72272273. The reversal of 72272272 is 27227227.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42198016 + 30074256 = 6496^2 + 5484^2 .

It is not an unprimeable number, because it can be changed into a prime (72272273) 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 in 3 ways as a sum of consecutive naturals, for example, 23953 + ... + 26800.

It is an arithmetic number, because the mean of its divisors is an integer number (7080183).

Almost surely, 2^72272272 is an apocalyptic number.

It is an amenable number.

72272272 is a deficient number, since it is larger than the sum of its proper divisors (69331388).

72272272 is a wasteful number, since it uses less digits than its factorization.

72272272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50850 (or 50844 counting only the distinct ones).

The product of its digits is 10976, while the sum is 31.

The square root of 72272272 is about 8501.3100166974. The cubic root of 72272272 is about 416.5405018195.

Adding to 72272272 its reverse (27227227), we get a palindrome (99499499).

The spelling of 72272272 in words is "seventy-two million, two hundred seventy-two thousand, two hundred seventy-two".