72936309 has 4 divisors (see below), whose sum is σ = 97248416. Its totient is φ = 48624204.

The previous prime is 72936293. The next prime is 72936317. The reversal of 72936309 is 90363927.

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 not a de Polignac number, because 72936309 - 2⁴ = 72936293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72936319) 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, 12156049 + ... + 12156054.

It is an arithmetic number, because the mean of its divisors is an integer number (24312104).

Almost surely, 2^72936309 is an apocalyptic number.

It is an amenable number.

72936309 is a deficient number, since it is larger than the sum of its proper divisors (24312107).

72936309 is a wasteful number, since it uses less digits than its factorization.

72936309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24312106.

The product of its (nonzero) digits is 61236, while the sum is 39.

The square root of 72936309 is about 8540.2756981259. The cubic root of 72936309 is about 417.8123380197.

The spelling of 72936309 in words is "seventy-two million, nine hundred thirty-six thousand, three hundred nine".