3640625 has 14 divisors (see below), whose sum is σ = 4570254. Its totient is φ = 2900000.

The previous prime is 3640597. The next prime is 3640633. The reversal of 3640625 is 5260463.

It can be written as a sum of positive squares in 7 ways, for example, as 3508129 + 132496 = 1873^2 + 364^2 .

It is not a de Polignac number, because 3640625 - 2⁶ = 3640561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3640594 and 3640603.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 15509 + ... + 15741.

Almost surely, 2^3640625 is an apocalyptic number.

It is an amenable number.

3640625 is a deficient number, since it is larger than the sum of its proper divisors (929629).

3640625 is an frugal number, since it uses more digits than its factorization.

3640625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 3640625 is about 1908.0421903092. The cubic root of 3640625 is about 153.8362373416.

The spelling of 3640625 in words is "three million, six hundred forty thousand, six hundred twenty-five".