645045 has 8 divisors (see below), whose sum is σ = 1032096. Its totient is φ = 344016.

The previous prime is 645041. The next prime is 645049. The reversal of 645045 is 540546.

It is an interprime number because it is at equal distance from previous prime (645041) and next prime (645049).

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

It is not a de Polignac number, because 645045 - 2² = 645041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645041) 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, 21487 + ... + 21516.

It is an arithmetic number, because the mean of its divisors is an integer number (129012).

2⁶⁴⁵⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

645045 is a deficient number, since it is larger than the sum of its proper divisors (387051).

645045 is a wasteful number, since it uses less digits than its factorization.

645045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43011.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 645045 is about 803.1469354981. The cubic root of 645045 is about 86.4032352612.

The spelling of 645045 in words is "six hundred forty-five thousand, forty-five".