3644651 has 4 divisors (see below), whose sum is σ = 3713472. Its totient is φ = 3575832.

The previous prime is 3644629. The next prime is 3644653. The reversal of 3644651 is 1564463.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3644651 - 2⁶ = 3644587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3644653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34331 + ... + 34436.

It is an arithmetic number, because the mean of its divisors is an integer number (928368).

Almost surely, 2^3644651 is an apocalyptic number.

3644651 is a deficient number, since it is larger than the sum of its proper divisors (68821).

3644651 is an equidigital number, since it uses as much as digits as its factorization.

3644651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68820.

The product of its digits is 8640, while the sum is 29.

The square root of 3644651 is about 1909.0969069170. The cubic root of 3644651 is about 153.8929232614.

The spelling of 3644651 in words is "three million, six hundred forty-four thousand, six hundred fifty-one".