640053 has 18 divisors (see below), whose sum is σ = 980694. Its totient is φ = 402192.

The previous prime is 640049. The next prime is 640061. The reversal of 640053 is 350046.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 636804 + 3249 = 798^2 + 57^2 .

It is not a de Polignac number, because 640053 - 2² = 640049 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640043) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3151 + ... + 3347.

It is an arithmetic number, because the mean of its divisors is an integer number (54483).

2⁶⁴⁰⁰⁵³ is an apocalyptic number.

It is an amenable number.

640053 is a deficient number, since it is larger than the sum of its proper divisors (340641).

640053 is a wasteful number, since it uses less digits than its factorization.

640053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 640053 is about 800.0331243142. The cubic root of 640053 is about 86.1797663906.

Adding to 640053 its reverse (350046), we get a palindrome (990099).

The spelling of 640053 in words is "six hundred forty thousand, fifty-three".