645825 has 24 divisors (see below), whose sum is σ = 1091200. Its totient is φ = 336960.

The previous prime is 645803. The next prime is 645833. The reversal of 645825 is 528546.

645825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645825 - 2⁹ = 645313 is a prime.

It is a super-3 number, since 3×645825³ = 808101313337671875, which contains 333 as substring.

It is an Ulam number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 645792 and 645801.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645825.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5871 + ... + 5979.

2⁶⁴⁵⁸²⁵ is an apocalyptic number.

It is an amenable number.

645825 is a deficient number, since it is larger than the sum of its proper divisors (445375).

645825 is a wasteful number, since it uses less digits than its factorization.

645825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 196 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 645825 is about 803.6323786409. The cubic root of 645825 is about 86.4380480143.

The spelling of 645825 in words is "six hundred forty-five thousand, eight hundred twenty-five".