745644209 has 16 divisors (see below), whose sum is σ = 790141440. Its totient is φ = 702535680.

The previous prime is 745644181. The next prime is 745644241. The reversal of 745644209 is 902446547.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-745644209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745644269) 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 in 15 ways as a sum of consecutive naturals, for example, 528497 + ... + 529905.

It is an arithmetic number, because the mean of its divisors is an integer number (49383840).

Almost surely, 2^745644209 is an apocalyptic number.

It is an amenable number.

745644209 is a deficient number, since it is larger than the sum of its proper divisors (44497231).

745644209 is a wasteful number, since it uses less digits than its factorization.

745644209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 745644209 is about 27306.4865737063. The cubic root of 745644209 is about 906.7979920038.

The spelling of 745644209 in words is "seven hundred forty-five million, six hundred forty-four thousand, two hundred nine".