72346321 has 4 divisors (see below), whose sum is σ = 72374692. Its totient is φ = 72317952.

The previous prime is 72346289. The next prime is 72346327. The reversal of 72346321 is 12364327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12364327 = 37 ⋅334171.

It can be written as a sum of positive squares in 2 ways, for example, as 52765696 + 19580625 = 7264^2 + 4425^2 .

It is a cyclic number.

It is not a de Polignac number, because 72346321 - 2⁵ = 72346289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72346321.

It is not an unprimeable number, because it can be changed into a prime (72346327) 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, 9936 + ... + 15601.

It is an arithmetic number, because the mean of its divisors is an integer number (18093673).

Almost surely, 2^72346321 is an apocalyptic number.

It is an amenable number.

72346321 is a deficient number, since it is larger than the sum of its proper divisors (28371).

72346321 is a wasteful number, since it uses less digits than its factorization.

72346321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28370.

The product of its digits is 6048, while the sum is 28.

The square root of 72346321 is about 8505.6640540289. The cubic root of 72346321 is about 416.6827134798.

The spelling of 72346321 in words is "seventy-two million, three hundred forty-six thousand, three hundred twenty-one".