72145209 has 8 divisors (see below), whose sum is σ = 97146432. Its totient is φ = 47620400.

The previous prime is 72145207. The next prime is 72145231. The reversal of 72145209 is 90254127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72145209 - 2¹ = 72145207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72145201) 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 7 ways as a sum of consecutive naturals, for example, 118749 + ... + 119354.

It is an arithmetic number, because the mean of its divisors is an integer number (12143304).

Almost surely, 2^72145209 is an apocalyptic number.

It is an amenable number.

72145209 is a deficient number, since it is larger than the sum of its proper divisors (25001223).

72145209 is a wasteful number, since it uses less digits than its factorization.

72145209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238207.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 72145209 is about 8493.8335867852. The cubic root of 72145209 is about 416.2962498547.

The spelling of 72145209 in words is "seventy-two million, one hundred forty-five thousand, two hundred nine".