646210225 has 24 divisors (see below), whose sum is σ = 822994200. Its totient is φ = 503040000.

The previous prime is 646210223. The next prime is 646210241. The reversal of 646210225 is 522012646.

It can be written as a sum of positive squares in 12 ways, for example, as 94148209 + 552062016 = 9703^2 + 23496^2 .

It is not a de Polignac number, because 646210225 - 2¹ = 646210223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646210193 and 646210202.

It is not an unprimeable number, because it can be changed into a prime (646210223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 615501 + ... + 616549.

It is an arithmetic number, because the mean of its divisors is an integer number (34291425).

Almost surely, 2^646210225 is an apocalyptic number.

It is an amenable number.

646210225 is a deficient number, since it is larger than the sum of its proper divisors (176783975).

646210225 is a wasteful number, since it uses less digits than its factorization.

646210225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701 (or 1696 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 646210225 is about 25420.6653138741. The cubic root of 646210225 is about 864.5523093463.

The spelling of 646210225 in words is "six hundred forty-six million, two hundred ten thousand, two hundred twenty-five".