72321779 has 2 divisors, whose sum is σ = 72321780. Its totient is φ = 72321778.

The previous prime is 72321763. The next prime is 72321793. The reversal of 72321779 is 97712327.

It is a strong prime.

It is an emirp because it is prime and its reverse (97712327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72321779 - 2⁴ = 72321763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72321719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36160889 + 36160890.

It is an arithmetic number, because the mean of its divisors is an integer number (36160890).

Almost surely, 2^72321779 is an apocalyptic number.

72321779 is a deficient number, since it is larger than the sum of its proper divisors (1).

72321779 is an equidigital number, since it uses as much as digits as its factorization.

72321779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37044, while the sum is 38.

The square root of 72321779 is about 8504.2212459460. The cubic root of 72321779 is about 416.6355911402.

The spelling of 72321779 in words is "seventy-two million, three hundred twenty-one thousand, seven hundred seventy-nine".