640150 has 48 divisors (see below), whose sum is σ = 1428480. Its totient is φ = 208800.

The previous prime is 640139. The next prime is 640151. The reversal of 640150 is 51046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640151) by changing a digit.

640150 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10821 + ... + 10879.

It is an arithmetic number, because the mean of its divisors is an integer number (29760).

2⁶⁴⁰¹⁵⁰ is an apocalyptic number.

640150 is an abundant number, since it is smaller than the sum of its proper divisors (788330).

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

640150 is a wasteful number, since it uses less digits than its factorization.

640150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 640150 is about 800.0937445075. The cubic root of 640150 is about 86.1841196838.

Adding to 640150 its reverse (51046), we get a palindrome (691196).

The spelling of 640150 in words is "six hundred forty thousand, one hundred fifty".