645883 has 4 divisors (see below), whose sum is σ = 738160. Its totient is φ = 553608.

The previous prime is 645877. The next prime is 645889. The reversal of 645883 is 388546.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (645877) and next prime (645889).

It is a cyclic number.

It is not a de Polignac number, because 645883 - 2⁵ = 645851 is a prime.

It is a Duffinian number.

645883 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (645889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46128 + ... + 46141.

It is an arithmetic number, because the mean of its divisors is an integer number (184540).

2⁶⁴⁵⁸⁸³ is an apocalyptic number.

645883 is a deficient number, since it is larger than the sum of its proper divisors (92277).

645883 is an equidigital number, since it uses as much as digits as its factorization.

645883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92276.

The product of its digits is 23040, while the sum is 34.

The square root of 645883 is about 803.6684639825. The cubic root of 645883 is about 86.4406355350.

The spelling of 645883 in words is "six hundred forty-five thousand, eight hundred eighty-three".