645207 has 8 divisors (see below), whose sum is σ = 864000. Its totient is φ = 428280.

The previous prime is 645187. The next prime is 645233. The reversal of 645207 is 702546.

It is a happy number.

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

It is not a de Polignac number, because 645207 - 2⁸ = 644951 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645207.

It is not an unprimeable number, because it can be changed into a prime (645257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1044 + ... + 1542.

It is an arithmetic number, because the mean of its divisors is an integer number (108000).

2⁶⁴⁵²⁰⁷ is an apocalyptic number.

645207 is a deficient number, since it is larger than the sum of its proper divisors (218793).

645207 is a wasteful number, since it uses less digits than its factorization.

645207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 645207 is about 803.2477824433. The cubic root of 645207 is about 86.4104679104.

The spelling of 645207 in words is "six hundred forty-five thousand, two hundred seven".