744664509 has 36 divisors (see below), whose sum is σ = 1143961728. Its totient is φ = 484068960.

The previous prime is 744664499. The next prime is 744664517. The reversal of 744664509 is 905466447.

It is not a de Polignac number, because 744664509 - 2⁴ = 744664493 is a prime.

It is a super-2 number, since 2×744664509² = 1109050461928422162, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744664009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 407572 + ... + 409394.

Almost surely, 2^744664509 is an apocalyptic number.

It is an amenable number.

744664509 is a deficient number, since it is larger than the sum of its proper divisors (399297219).

744664509 is an equidigital number, since it uses as much as digits as its factorization.

744664509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920 (or 1867 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 744664509 is about 27288.5417162589. The cubic root of 744664509 is about 906.4006714271.

The spelling of 744664509 in words is "seven hundred forty-four million, six hundred sixty-four thousand, five hundred nine".