3640635 has 24 divisors (see below), whose sum is σ = 6683040. Its totient is φ = 1827072.

The previous prime is 3640633. The next prime is 3640643. The reversal of 3640635 is 5360463.

It is not a de Polignac number, because 3640635 - 2¹ = 3640633 is a prime.

It is a d-powerful number, because it can be written as 3³ + 6⁵ + 4³ + 0 + 6⁸ + 3³ + 5⁹ .

It is a junction number, because it is equal to n+sod(n) for n = 3640599 and 3640608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640633) 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, 1615 + ... + 3144.

It is an arithmetic number, because the mean of its divisors is an integer number (278460).

Almost surely, 2^3640635 is an apocalyptic number.

3640635 is a deficient number, since it is larger than the sum of its proper divisors (3042405).

3640635 is a wasteful number, since it uses less digits than its factorization.

3640635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4787 (or 4784 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 3640635 is about 1908.0448107945. The cubic root of 3640635 is about 153.8363781930.

The spelling of 3640635 in words is "three million, six hundred forty thousand, six hundred thirty-five".