645227 has 4 divisors (see below), whose sum is σ = 703896. Its totient is φ = 586560.

The previous prime is 645187. The next prime is 645233. The reversal of 645227 is 722546.

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

It is a cyclic number.

It is not a de Polignac number, because 645227 - 2¹² = 641131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645196 and 645205.

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 3 ways as a sum of consecutive naturals, for example, 29318 + ... + 29339.

It is an arithmetic number, because the mean of its divisors is an integer number (175974).

2⁶⁴⁵²²⁷ is an apocalyptic number.

645227 is a deficient number, since it is larger than the sum of its proper divisors (58669).

645227 is a wasteful number, since it uses less digits than its factorization.

645227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58668.

The product of its digits is 3360, while the sum is 26.

The square root of 645227 is about 803.2602318054. The cubic root of 645227 is about 86.4113607460.

The spelling of 645227 in words is "six hundred forty-five thousand, two hundred twenty-seven".