73572209 has 4 divisors (see below), whose sum is σ = 77900004. Its totient is φ = 69244416.

The previous prime is 73572203. The next prime is 73572223. The reversal of 73572209 is 90227537.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90227537 = 2011 ⋅44867.

It can be written as a sum of positive squares in 2 ways, for example, as 55056400 + 18515809 = 7420^2 + 4303^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73572209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73572203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2163872 + ... + 2163905.

It is an arithmetic number, because the mean of its divisors is an integer number (19475001).

Almost surely, 2^73572209 is an apocalyptic number.

It is an amenable number.

73572209 is a deficient number, since it is larger than the sum of its proper divisors (4327795).

73572209 is a wasteful number, since it uses less digits than its factorization.

73572209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327794.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 73572209 is about 8577.4243803137. The cubic root of 73572209 is about 419.0230676348.

The spelling of 73572209 in words is "seventy-three million, five hundred seventy-two thousand, two hundred nine".