645765207 has 8 divisors (see below), whose sum is σ = 875614080. Its totient is φ = 423213240.

The previous prime is 645765199. The next prime is 645765259. The reversal of 645765207 is 702567546.

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

It is not a de Polignac number, because 645765207 - 2³ = 645765199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645765277) 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 7 ways as a sum of consecutive naturals, for example, 1824019 + ... + 1824372.

It is an arithmetic number, because the mean of its divisors is an integer number (109451760).

Almost surely, 2^645765207 is an apocalyptic number.

645765207 is a deficient number, since it is larger than the sum of its proper divisors (229848873).

645765207 is a wasteful number, since it uses less digits than its factorization.

645765207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3648453.

The product of its (nonzero) digits is 352800, while the sum is 42.

The square root of 645765207 is about 25411.9107309938. The cubic root of 645765207 is about 864.3538034128.

The spelling of 645765207 in words is "six hundred forty-five million, seven hundred sixty-five thousand, two hundred seven".