3644697409 has 8 divisors (see below), whose sum is σ = 3784401000. Its totient is φ = 3505928832.

The previous prime is 3644697403. The next prime is 3644697437. The reversal of 3644697409 is 9047964463.

It can be written as a sum of positive squares in 4 ways, for example, as 430147600 + 3214549809 = 20740^2 + 56697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3644697409 - 2⁵ = 3644697377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3644697403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225804 + ... + 241405.

It is an arithmetic number, because the mean of its divisors is an integer number (473050125).

Almost surely, 2^3644697409 is an apocalyptic number.

It is an amenable number.

3644697409 is a deficient number, since it is larger than the sum of its proper divisors (139703591).

3644697409 is a wasteful number, since it uses less digits than its factorization.

3644697409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467507.

The product of its (nonzero) digits is 3919104, while the sum is 52.

The square root of 3644697409 is about 60371.3293625376. The cubic root of 3644697409 is about 1538.9357645481.

The spelling of 3644697409 in words is "three billion, six hundred forty-four million, six hundred ninety-seven thousand, four hundred nine".