645415207 has 8 divisors (see below), whose sum is σ = 652812336. Its totient is φ = 638047872.

The previous prime is 645415187. The next prime is 645415231. The reversal of 645415207 is 702514546.

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

It is a cyclic number.

It is not a de Polignac number, because 645415207 - 2¹⁹ = 644890919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645415247) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 37668 + ... + 52054.

It is an arithmetic number, because the mean of its divisors is an integer number (81601542).

Almost surely, 2^645415207 is an apocalyptic number.

645415207 is a deficient number, since it is larger than the sum of its proper divisors (7397129).

645415207 is a wasteful number, since it uses less digits than its factorization.

645415207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14897.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 645415207 is about 25405.0232631265. The cubic root of 645415207 is about 864.1976173875.

The spelling of 645415207 in words is "six hundred forty-five million, four hundred fifteen thousand, two hundred seven".