645836434 has 8 divisors (see below), whose sum is σ = 969305148. Its totient is φ = 322734720.

The previous prime is 645836413. The next prime is 645836437. The reversal of 645836434 is 434638546.

It can be written as a sum of positive squares in 2 ways, for example, as 622652209 + 23184225 = 24953^2 + 4815^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 87307 + ... + 94414.

Almost surely, 2^645836434 is an apocalyptic number.

645836434 is a deficient number, since it is larger than the sum of its proper divisors (323468714).

645836434 is a wasteful number, since it uses less digits than its factorization.

645836434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183500.

The product of its digits is 829440, while the sum is 43.

The square root of 645836434 is about 25413.3121414742. The cubic root of 645836434 is about 864.3855812501.

It can be divided in two parts, 64583 and 6434, that added together give a palindrome (71017).

The spelling of 645836434 in words is "six hundred forty-five million, eight hundred thirty-six thousand, four hundred thirty-four".