645836433 has 16 divisors (see below), whose sum is σ = 939859200. Its totient is φ = 391224080.

The previous prime is 645836413. The next prime is 645836437. The reversal of 645836433 is 334638546.

It is a cyclic number.

It is not a de Polignac number, because 645836433 - 2¹⁶ = 645770897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645836437) 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, 93658 + ... + 100316.

It is an arithmetic number, because the mean of its divisors is an integer number (58741200).

Almost surely, 2^645836433 is an apocalyptic number.

It is an amenable number.

645836433 is a deficient number, since it is larger than the sum of its proper divisors (294022767).

645836433 is a wasteful number, since it uses less digits than its factorization.

645836433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9612.

The product of its digits is 622080, while the sum is 42.

The square root of 645836433 is about 25413.3121217995. The cubic root of 645836433 is about 864.3855808039.

The spelling of 645836433 in words is "six hundred forty-five million, eight hundred thirty-six thousand, four hundred thirty-three".