645063 has 8 divisors (see below), whose sum is σ = 876528. Its totient is φ = 421824.

The previous prime is 645049. The next prime is 645067. The reversal of 645063 is 360546.

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

It is not a de Polignac number, because 645063 - 2⁶ = 644999 is a prime.

It is a super-2 number, since 2×645063² = 832212547938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645067) 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, 1870 + ... + 2187.

It is an arithmetic number, because the mean of its divisors is an integer number (109566).

2⁶⁴⁵⁰⁶³ is an apocalyptic number.

645063 is a deficient number, since it is larger than the sum of its proper divisors (231465).

645063 is a wasteful number, since it uses less digits than its factorization.

645063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4113.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 645063 is about 803.1581413395. The cubic root of 645063 is about 86.4040389487.

The spelling of 645063 in words is "six hundred forty-five thousand, sixty-three".