72836209 has 4 divisors (see below), whose sum is σ = 73318720. Its totient is φ = 72353700.

The previous prime is 72836201. The next prime is 72836221. The reversal of 72836209 is 90263827.

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 72836209 - 2³ = 72836201 is a prime.

It is a super-2 number, since 2×72836209² = 10610226682983362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72836201) 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, 241029 + ... + 241330.

It is an arithmetic number, because the mean of its divisors is an integer number (18329680).

Almost surely, 2^72836209 is an apocalyptic number.

It is an amenable number.

72836209 is a deficient number, since it is larger than the sum of its proper divisors (482511).

72836209 is a wasteful number, since it uses less digits than its factorization.

72836209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482510.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 72836209 is about 8534.4132194311. The cubic root of 72836209 is about 417.6211110745.

The spelling of 72836209 in words is "seventy-two million, eight hundred thirty-six thousand, two hundred nine".