645863323 has 8 divisors (see below), whose sum is σ = 741219840. Its totient is φ = 551279400.

The previous prime is 645863291. The next prime is 645863329. The reversal of 645863323 is 323368546.

It is a happy number.

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

It is not a de Polignac number, because 645863323 - 2⁵ = 645863291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645863329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191353 + ... + 194698.

It is an arithmetic number, because the mean of its divisors is an integer number (92652480).

Almost surely, 2^645863323 is an apocalyptic number.

645863323 is a deficient number, since it is larger than the sum of its proper divisors (95356517).

645863323 is a wasteful number, since it uses less digits than its factorization.

645863323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386297.

The product of its digits is 311040, while the sum is 40.

The square root of 645863323 is about 25413.8411697248. The cubic root of 645863323 is about 864.3975771364.

The spelling of 645863323 in words is "six hundred forty-five million, eight hundred sixty-three thousand, three hundred twenty-three".