72235309 has 4 divisors (see below), whose sum is σ = 73149760. Its totient is φ = 71320860.

The previous prime is 72235291. The next prime is 72235333. The reversal of 72235309 is 90353227.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90353227 = 19 ⋅4755433.

It is a cyclic number.

It is not a de Polignac number, because 72235309 - 2¹¹ = 72233261 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 (72235409) 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, 457107 + ... + 457264.

It is an arithmetic number, because the mean of its divisors is an integer number (18287440).

Almost surely, 2^72235309 is an apocalyptic number.

72235309 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

72235309 is a deficient number, since it is larger than the sum of its proper divisors (914451).

72235309 is an equidigital number, since it uses as much as digits as its factorization.

72235309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914450.

The product of its (nonzero) digits is 11340, while the sum is 31.

The square root of 72235309 is about 8499.1357795955. The cubic root of 72235309 is about 416.4694777522.

The spelling of 72235309 in words is "seventy-two million, two hundred thirty-five thousand, three hundred nine".