640084 has 12 divisors (see below), whose sum is σ = 1186164. Its totient is φ = 301184.

The previous prime is 640069. The next prime is 640099. The reversal of 640084 is 480046.

It is an interprime number because it is at equal distance from previous prime (640069) and next prime (640099).

It can be written as a sum of positive squares in 2 ways, for example, as 595984 + 44100 = 772^2 + 210^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4639 + ... + 4774.

It is an arithmetic number, because the mean of its divisors is an integer number (98847).

2⁶⁴⁰⁰⁸⁴ is an apocalyptic number.

It is an amenable number.

640084 is a deficient number, since it is larger than the sum of its proper divisors (546080).

640084 is a wasteful number, since it uses less digits than its factorization.

640084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9434 (or 9432 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 640084 is about 800.0524982775. The cubic root of 640084 is about 86.1811576970.

The spelling of 640084 in words is "six hundred forty thousand, eighty-four".