3644542747 has 4 divisors (see below), whose sum is σ = 3672363816. Its totient is φ = 3616721680.

The previous prime is 3644542711. The next prime is 3644542771. The reversal of 3644542747 is 7472454463.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3644542747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3644542697 and 3644542706.

It is not an unprimeable number, because it can be changed into a prime (3644542777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13910338 + ... + 13910599.

It is an arithmetic number, because the mean of its divisors is an integer number (918090954).

Almost surely, 2^3644542747 is an apocalyptic number.

3644542747 is a deficient number, since it is larger than the sum of its proper divisors (27821069).

3644542747 is a wasteful number, since it uses less digits than its factorization.

3644542747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27821068.

The product of its digits is 2257920, while the sum is 46.

The square root of 3644542747 is about 60370.0484263513. The cubic root of 3644542747 is about 1538.9139960972.

The spelling of 3644542747 in words is "three billion, six hundred forty-four million, five hundred forty-two thousand, seven hundred forty-seven".