646025 has 6 divisors (see below), whose sum is σ = 801102. Its totient is φ = 516800.

The previous prime is 646013. The next prime is 646027. The reversal of 646025 is 520646.

It can be written as a sum of positive squares in 3 ways, for example, as 10816 + 635209 = 104^2 + 797^2 .

It is not a de Polignac number, because 646025 - 2¹² = 641929 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646025.

It is not an unprimeable number, because it can be changed into a prime (646027) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 12896 + ... + 12945.

It is an arithmetic number, because the mean of its divisors is an integer number (133517).

2⁶⁴⁶⁰²⁵ is an apocalyptic number.

It is an amenable number.

646025 is a deficient number, since it is larger than the sum of its proper divisors (155077).

646025 is a wasteful number, since it uses less digits than its factorization.

646025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25851 (or 25846 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 646025 is about 803.7568040147. The cubic root of 646025 is about 86.4469698457.

The spelling of 646025 in words is "six hundred forty-six thousand, twenty-five".