640350 has 36 divisors (see below), whose sum is σ = 1721616. Its totient is φ = 170640.

The previous prime is 640333. The next prime is 640363. The reversal of 640350 is 53046.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 262 + ... + 1161.

2⁶⁴⁰³⁵⁰ is an apocalyptic number.

640350 is an abundant number, since it is smaller than the sum of its proper divisors (1081266).

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

640350 is a wasteful number, since it uses less digits than its factorization.

640350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441 (or 1433 counting only the distinct ones).

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

The square root of 640350 is about 800.2187201009. The cubic root of 640350 is about 86.1930941581.

Adding to 640350 its reverse (53046), we get a palindrome (693396).

It can be divided in two parts, 640 and 350, that added together give a triangular number (990 = T₄₄).

The spelling of 640350 in words is "six hundred forty thousand, three hundred fifty".