722640449 has 2 divisors, whose sum is σ = 722640450. Its totient is φ = 722640448.

The previous prime is 722640439. The next prime is 722640467. The reversal of 722640449 is 944046227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 711182224 + 11458225 = 26668^2 + 3385^2 .

It is a cyclic number.

It is not a de Polignac number, because 722640449 - 2¹⁶ = 722574913 is a prime.

It is not a weakly prime, because it can be changed into another prime (722640419) 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, 361320224 + 361320225.

It is an arithmetic number, because the mean of its divisors is an integer number (361320225).

Almost surely, 2^722640449 is an apocalyptic number.

It is an amenable number.

722640449 is a deficient number, since it is larger than the sum of its proper divisors (1).

722640449 is an equidigital number, since it uses as much as digits as its factorization.

722640449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 722640449 is about 26881.9725652713. The cubic root of 722640449 is about 897.3752534931.

The spelling of 722640449 in words is "seven hundred twenty-two million, six hundred forty thousand, four hundred forty-nine".