72922472009 has 4 divisors (see below), whose sum is σ = 77212029204. Its totient is φ = 68632914816.

The previous prime is 72922471981. The next prime is 72922472033. The reversal of 72922472009 is 90027422927.

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

It can be written as a sum of positive squares in 2 ways, for example, as 62230291600 + 10692180409 = 249460^2 + 103403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72922472009 is a prime.

It is a super-3 number, since 3×72922472009³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72922472069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144778572 + ... + 2144778605.

It is an arithmetic number, because the mean of its divisors is an integer number (19303007301).

Almost surely, 2^72922472009 is an apocalyptic number.

It is an amenable number.

72922472009 is a deficient number, since it is larger than the sum of its proper divisors (4289557195).

72922472009 is a wasteful number, since it uses less digits than its factorization.

72922472009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4289557194.

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 72922472009 in words is "seventy-two billion, nine hundred twenty-two million, four hundred seventy-two thousand, nine".