640283 has 12 divisors (see below), whose sum is σ = 759240. Its totient is φ = 538272.

The previous prime is 640279. The next prime is 640303. The reversal of 640283 is 382046.

It is a happy number.

640283 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 640283 - 2² = 640279 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640283.

It is not an unprimeable number, because it can be changed into a prime (640223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3488 + ... + 3666.

It is an arithmetic number, because the mean of its divisors is an integer number (63270).

2⁶⁴⁰²⁸³ is an apocalyptic number.

640283 is a deficient number, since it is larger than the sum of its proper divisors (118957).

640283 is a wasteful number, since it uses less digits than its factorization.

640283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 640283 is about 800.1768554513. The cubic root of 640283 is about 86.1900879173.

The spelling of 640283 in words is "six hundred forty thousand, two hundred eighty-three".