645803336 has 8 divisors (see below), whose sum is σ = 1210881270. Its totient is φ = 322901664.

The previous prime is 645803311. The next prime is 645803339. The reversal of 645803336 is 633308546.

645803336 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 474978436 + 170824900 = 21794^2 + 13070^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 645803336.

It is not an unprimeable number, because it can be changed into a prime (645803339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40362701 + ... + 40362716.

Almost surely, 2^645803336 is an apocalyptic number.

It is an amenable number.

645803336 is a deficient number, since it is larger than the sum of its proper divisors (565077934).

645803336 is a wasteful number, since it uses less digits than its factorization.

645803336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80725423 (or 80725419 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 645803336 is about 25412.6609389887. The cubic root of 645803336 is about 864.3708149092.

The spelling of 645803336 in words is "six hundred forty-five million, eight hundred three thousand, three hundred thirty-six".