72304291 has 4 divisors (see below), whose sum is σ = 76109800. Its totient is φ = 68498784.

The previous prime is 72304273. The next prime is 72304301. The reversal of 72304291 is 19240327.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72304291 - 2⁵ = 72304259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72304201) 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, 1902726 + ... + 1902763.

It is an arithmetic number, because the mean of its divisors is an integer number (19027450).

Almost surely, 2^72304291 is an apocalyptic number.

72304291 is a deficient number, since it is larger than the sum of its proper divisors (3805509).

72304291 is a wasteful number, since it uses less digits than its factorization.

72304291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3805508.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 72304291 is about 8503.1929885191. The cubic root of 72304291 is about 416.6020064640.

The spelling of 72304291 in words is "seventy-two million, three hundred four thousand, two hundred ninety-one".