3640668 has 12 divisors (see below), whose sum is σ = 8494920. Its totient is φ = 1213552.

The previous prime is 3640661. The next prime is 3640697. The reversal of 3640668 is 8660463.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640661) 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 3 ways as a sum of consecutive naturals, for example, 151683 + ... + 151706.

It is an arithmetic number, because the mean of its divisors is an integer number (707910).

Almost surely, 2^3640668 is an apocalyptic number.

It is an amenable number.

3640668 is an abundant number, since it is smaller than the sum of its proper divisors (4854252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3640668 is a wasteful number, since it uses less digits than its factorization.

3640668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303396 (or 303394 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 3640668 is about 1908.0534583706. The cubic root of 3640668 is about 153.8368430006.

It can be divided in two parts, 36 and 40668, that added together give a palindrome (40704).

The spelling of 3640668 in words is "three million, six hundred forty thousand, six hundred sixty-eight".