645410 has 16 divisors (see below), whose sum is σ = 1170936. Its totient is φ = 256128.

The previous prime is 645409. The next prime is 645419. The reversal of 645410 is 14546.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 312481 + 332929 = 559^2 + 577^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (645419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2192 + ... + 2468.

2⁶⁴⁵⁴¹⁰ is an apocalyptic number.

645410 is a deficient number, since it is larger than the sum of its proper divisors (525526).

645410 is a wasteful number, since it uses less digits than its factorization.

645410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 645410 is about 803.3741345102. The cubic root of 645410 is about 86.4195293359.

Adding to 645410 its reverse (14546), we get a palindrome (659956).

The spelling of 645410 in words is "six hundred forty-five thousand, four hundred ten".