3649664 has 16 divisors (see below), whose sum is σ = 7271070. Its totient is φ = 1824768.

The previous prime is 3649637. The next prime is 3649669. The reversal of 3649664 is 4669463.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2190400 + 1459264 = 1480^2 + 1208^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (3649669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14129 + ... + 14384.

Almost surely, 2^3649664 is an apocalyptic number.

It is an amenable number.

3649664 is a deficient number, since it is larger than the sum of its proper divisors (3621406).

3649664 is an equidigital number, since it uses as much as digits as its factorization.

3649664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28527 (or 28515 counting only the distinct ones).

The product of its digits is 93312, while the sum is 38.

The square root of 3649664 is about 1910.4093802115. The cubic root of 3649664 is about 153.9634477819.

The spelling of 3649664 in words is "three million, six hundred forty-nine thousand, six hundred sixty-four".