645602843 has 16 divisors (see below), whose sum is σ = 704464800. Its totient is φ = 589317120.

The previous prime is 645602831. The next prime is 645602879. The reversal of 645602843 is 348206546.

It is not a de Polignac number, because 645602843 - 2⁶ = 645602779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645602797 and 645602806.

It is not an unprimeable number, because it can be changed into a prime (645602443) 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 15 ways as a sum of consecutive naturals, for example, 369953 + ... + 371693.

It is an arithmetic number, because the mean of its divisors is an integer number (44029050).

Almost surely, 2^645602843 is an apocalyptic number.

645602843 is a deficient number, since it is larger than the sum of its proper divisors (58861957).

645602843 is a wasteful number, since it uses less digits than its factorization.

645602843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462.

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 645602843 is about 25408.7158864827. The cubic root of 645602843 is about 864.2813561813.

The spelling of 645602843 in words is "six hundred forty-five million, six hundred two thousand, eight hundred forty-three".