645241306 has 8 divisors (see below), whose sum is σ = 981120564. Its totient is φ = 318201120.

The previous prime is 645241301. The next prime is 645241309. The reversal of 645241306 is 603142546.

It can be written as a sum of positive squares in 2 ways, for example, as 609349225 + 35892081 = 24685^2 + 5991^2 .

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 (645241301) 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, 2209585 + ... + 2209876.

Almost surely, 2^645241306 is an apocalyptic number.

645241306 is a deficient number, since it is larger than the sum of its proper divisors (335879258).

645241306 is a wasteful number, since it uses less digits than its factorization.

645241306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4419536.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 645241306 is about 25401.6004613883. The cubic root of 645241306 is about 864.1199938010.

The spelling of 645241306 in words is "six hundred forty-five million, two hundred forty-one thousand, three hundred six".