645007 has 8 divisors (see below), whose sum is σ = 709632. Its totient is φ = 581400.

The previous prime is 644999. The next prime is 645011. The reversal of 645007 is 700546.

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 645007 - 2³ = 644999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645037) 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, 1948 + ... + 2254.

It is an arithmetic number, because the mean of its divisors is an integer number (88704).

2⁶⁴⁵⁰⁰⁷ is an apocalyptic number.

645007 is a deficient number, since it is larger than the sum of its proper divisors (64625).

645007 is a wasteful number, since it uses less digits than its factorization.

645007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 645007 is about 803.1232782083. The cubic root of 645007 is about 86.4015385386.

The spelling of 645007 in words is "six hundred forty-five thousand, seven".