72830209 has 2 divisors, whose sum is σ = 72830210. Its totient is φ = 72830208.

The previous prime is 72830189. The next prime is 72830269. The reversal of 72830209 is 90203827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67699984 + 5130225 = 8228^2 + 2265^2 .

It is a cyclic number.

It is not a de Polignac number, because 72830209 - 2¹³ = 72822017 is a prime.

It is not a weakly prime, because it can be changed into another prime (72830269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36415104 + 36415105.

It is an arithmetic number, because the mean of its divisors is an integer number (36415105).

Almost surely, 2^72830209 is an apocalyptic number.

It is an amenable number.

72830209 is a deficient number, since it is larger than the sum of its proper divisors (1).

72830209 is an equidigital number, since it uses as much as digits as its factorization.

72830209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 72830209 is about 8534.0616941759. The cubic root of 72830209 is about 417.6096433558.

The spelling of 72830209 in words is "seventy-two million, eight hundred thirty thousand, two hundred nine".