645744113 has 8 divisors (see below), whose sum is σ = 770080128. Its totient is φ = 529429824.

The previous prime is 645744061. The next prime is 645744119. The reversal of 645744113 is 311447546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645744113 - 2¹⁰ = 645743089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645744119) 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 7 ways as a sum of consecutive naturals, for example, 2005256 + ... + 2005577.

It is an arithmetic number, because the mean of its divisors is an integer number (96260016).

Almost surely, 2^645744113 is an apocalyptic number.

It is an amenable number.

645744113 is a deficient number, since it is larger than the sum of its proper divisors (124336015).

645744113 is a wasteful number, since it uses less digits than its factorization.

645744113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4010863.

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

The square root of 645744113 is about 25411.4956860079. The cubic root of 645744113 is about 864.3443919025.

The spelling of 645744113 in words is "six hundred forty-five million, seven hundred forty-four thousand, one hundred thirteen".