645034223 has 6 divisors (see below), whose sum is σ = 649795776. Its totient is φ = 640307312.

The previous prime is 645034193. The next prime is 645034231. The reversal of 645034223 is 322430546.

It is not a de Polignac number, because 645034223 - 2¹⁰ = 645033199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645034253) 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 5 ways as a sum of consecutive naturals, for example, 1586 + ... + 35952.

It is an arithmetic number, because the mean of its divisors is an integer number (108299296).

Almost surely, 2^645034223 is an apocalyptic number.

645034223 is a deficient number, since it is larger than the sum of its proper divisors (4761553).

645034223 is an equidigital number, since it uses as much as digits as its factorization.

645034223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34641 (or 34504 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 29.

The square root of 645034223 is about 25397.5239541180. The cubic root of 645034223 is about 864.0275406852.

Adding to 645034223 its reverse (322430546), we get a palindrome (967464769).

The spelling of 645034223 in words is "six hundred forty-five million, thirty-four thousand, two hundred twenty-three".