3640636 has 24 divisors (see below), whose sum is σ = 6632640. Its totient is φ = 1747200.

The previous prime is 3640633. The next prime is 3640643. The reversal of 3640636 is 6360463.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12816 + ... + 13096.

It is an arithmetic number, because the mean of its divisors is an integer number (276360).

Almost surely, 2^3640636 is an apocalyptic number.

It is an amenable number.

3640636 is a deficient number, since it is larger than the sum of its proper divisors (2992004).

3640636 is a wasteful number, since it uses less digits than its factorization.

3640636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 3640636 is about 1908.0450728429. The cubic root of 3640636 is about 153.8363922781.

Subtracting from 3640636 its product of nonzero digits (7776), we obtain a triangular number (3632860 = T₂₆₉₅).

The spelling of 3640636 in words is "three million, six hundred forty thousand, six hundred thirty-six".