640050 has 48 divisors (see below), whose sum is σ = 1687392. Its totient is φ = 160000.

The previous prime is 640049. The next prime is 640061. The reversal of 640050 is 50046.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2425 + ... + 2675.

It is an arithmetic number, because the mean of its divisors is an integer number (35154).

2⁶⁴⁰⁰⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (843696).

640050 is an abundant number, since it is smaller than the sum of its proper divisors (1047342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640050 is a wasteful number, since it uses less digits than its factorization.

640050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 640050 is about 800.0312493897. The cubic root of 640050 is about 86.1796317456.

Adding to 640050 its reverse (50046), we get a palindrome (690096).

The spelling of 640050 in words is "six hundred forty thousand, fifty".