645763445 has 16 divisors (see below), whose sum is σ = 848795760. Its totient is φ = 469453824.

The previous prime is 645763403. The next prime is 645763453. The reversal of 645763445 is 544367546.

It can be written as a sum of positive squares in 8 ways, for example, as 8655364 + 637108081 = 2942^2 + 25241^2 .

It is a cyclic number.

It is not a de Polignac number, because 645763445 - 2⁶ = 645763381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645763396 and 645763405.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 128522 + ... + 133451.

It is an arithmetic number, because the mean of its divisors is an integer number (53049735).

Almost surely, 2^645763445 is an apocalyptic number.

It is an amenable number.

645763445 is a deficient number, since it is larger than the sum of its proper divisors (203032315).

645763445 is a wasteful number, since it uses less digits than its factorization.

645763445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262024.

The product of its digits is 1209600, while the sum is 44.

The square root of 645763445 is about 25411.8760621879. The cubic root of 645763445 is about 864.3530172691.

The spelling of 645763445 in words is "six hundred forty-five million, seven hundred sixty-three thousand, four hundred forty-five".