72320849 has 2 divisors, whose sum is σ = 72320850. Its totient is φ = 72320848.

The previous prime is 72320819. The next prime is 72320869. The reversal of 72320849 is 94802327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43890625 + 28430224 = 6625^2 + 5332^2 .

It is an emirp because it is prime and its reverse (94802327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72320849 - 2¹² = 72316753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72320819) 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 as a sum of consecutive naturals, namely, 36160424 + 36160425.

It is an arithmetic number, because the mean of its divisors is an integer number (36160425).

Almost surely, 2^72320849 is an apocalyptic number.

It is an amenable number.

72320849 is a deficient number, since it is larger than the sum of its proper divisors (1).

72320849 is an equidigital number, since it uses as much as digits as its factorization.

72320849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 72320849 is about 8504.1665670423. The cubic root of 72320849 is about 416.6338052662.

The spelling of 72320849 in words is "seventy-two million, three hundred twenty thousand, eight hundred forty-nine".