72229309 has 4 divisors (see below), whose sum is σ = 72571840. Its totient is φ = 71886780.

The previous prime is 72229273. The next prime is 72229321. The reversal of 72229309 is 90392227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72229309 - 2¹¹ = 72227261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72229369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170949 + ... + 171370.

It is an arithmetic number, because the mean of its divisors is an integer number (18142960).

Almost surely, 2^72229309 is an apocalyptic number.

It is an amenable number.

72229309 is a deficient number, since it is larger than the sum of its proper divisors (342531).

72229309 is a wasteful number, since it uses less digits than its factorization.

72229309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342530.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 72229309 is about 8498.7827952007. The cubic root of 72229309 is about 416.4579465214.

The spelling of 72229309 in words is "seventy-two million, two hundred twenty-nine thousand, three hundred nine".