640410 has 16 divisors (see below), whose sum is σ = 1537056. Its totient is φ = 170768.

The previous prime is 640369. The next prime is 640411. The reversal of 640410 is 14046.

640410 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 640410.

It is not an unprimeable number, because it can be changed into a prime (640411) by changing a digit.

640410 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 7 ways as a sum of consecutive naturals, for example, 10644 + ... + 10703.

It is an arithmetic number, because the mean of its divisors is an integer number (96066).

2⁶⁴⁰⁴¹⁰ is an apocalyptic number.

640410 is an abundant number, since it is smaller than the sum of its proper divisors (896646).

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

640410 is a wasteful number, since it uses less digits than its factorization.

640410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21357.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 640410 is about 800.2562089731. The cubic root of 640410 is about 86.1957861360.

Adding to 640410 its reverse (14046), we get a palindrome (654456).

The spelling of 640410 in words is "six hundred forty thousand, four hundred ten".