720444509 has 2 divisors, whose sum is σ = 720444510. Its totient is φ = 720444508.

The previous prime is 720444499. The next prime is 720444533. The reversal of 720444509 is 905444027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 530611225 + 189833284 = 23035^2 + 13778^2 .

It is a cyclic number.

It is not a de Polignac number, because 720444509 - 2⁸ = 720444253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720440509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360222254 + 360222255.

It is an arithmetic number, because the mean of its divisors is an integer number (360222255).

Almost surely, 2^720444509 is an apocalyptic number.

It is an amenable number.

720444509 is a deficient number, since it is larger than the sum of its proper divisors (1).

720444509 is an equidigital number, since it uses as much as digits as its factorization.

720444509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 720444509 is about 26841.0973881472. The cubic root of 720444509 is about 896.4653581023.

The spelling of 720444509 in words is "seven hundred twenty million, four hundred forty-four thousand, five hundred nine".