645449 has 16 divisors (see below), whose sum is σ = 814080. Its totient is φ = 498960.

The previous prime is 645443. The next prime is 645467. The reversal of 645449 is 944546.

It is a happy number.

645449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645449 - 2⁴ = 645433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2954 + ... + 3164.

It is an arithmetic number, because the mean of its divisors is an integer number (50880).

2⁶⁴⁵⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

645449 is a deficient number, since it is larger than the sum of its proper divisors (168631).

645449 is a wasteful number, since it uses less digits than its factorization.

645449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260.

The product of its digits is 17280, while the sum is 32.

The square root of 645449 is about 803.3984067696. The cubic root of 645449 is about 86.4212699834.

The spelling of 645449 in words is "six hundred forty-five thousand, four hundred forty-nine".