645892 has 12 divisors (see below), whose sum is σ = 1217356. Its totient is φ = 298080.

The previous prime is 645889. The next prime is 645893. The reversal of 645892 is 298546.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 391876 + 254016 = 626^2 + 504^2 .

It is not an unprimeable number, because it can be changed into a prime (645893) 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, 6159 + ... + 6262.

2⁶⁴⁵⁸⁹² is an apocalyptic number.

It is an amenable number.

645892 is a deficient number, since it is larger than the sum of its proper divisors (571464).

645892 is a wasteful number, since it uses less digits than its factorization.

645892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12438 (or 12436 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 645892 is about 803.6740632869. The cubic root of 645892 is about 86.4410370329.

The spelling of 645892 in words is "six hundred forty-five thousand, eight hundred ninety-two".