645814 has 16 divisors (see below), whose sum is σ = 1063440. Its totient is φ = 292320.

The previous prime is 645803. The next prime is 645833. The reversal of 645814 is 418546.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1324 + ... + 1744.

It is an arithmetic number, because the mean of its divisors is an integer number (66465).

2⁶⁴⁵⁸¹⁴ is an apocalyptic number.

645814 is a deficient number, since it is larger than the sum of its proper divisors (417626).

645814 is a wasteful number, since it uses less digits than its factorization.

645814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495.

The product of its digits is 3840, while the sum is 28.

The square root of 645814 is about 803.6255346864. The cubic root of 645814 is about 86.4375572601.

The spelling of 645814 in words is "six hundred forty-five thousand, eight hundred fourteen".