645003272 has 16 divisors (see below), whose sum is σ = 1210488300. Its totient is φ = 322206400.

The previous prime is 645003223. The next prime is 645003299. The reversal of 645003272 is 272300546.

It can be written as a sum of positive squares in 2 ways, for example, as 581099236 + 63904036 = 24106^2 + 7994^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27479 + ... + 45222.

Almost surely, 2^645003272 is an apocalyptic number.

It is an amenable number.

645003272 is a deficient number, since it is larger than the sum of its proper divisors (565485028).

645003272 is a wasteful number, since it uses less digits than its factorization.

645003272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73816 (or 73812 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 645003272 is about 25396.9146157560. The cubic root of 645003272 is about 864.0137207755.

The spelling of 645003272 in words is "six hundred forty-five million, three thousand, two hundred seventy-two".