3644478853 has 4 divisors (see below), whose sum is σ = 3858859980. Its totient is φ = 3430097728.

The previous prime is 3644478839. The next prime is 3644478857. The reversal of 3644478853 is 3588744463.

3644478853 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1833295489 + 1811183364 = 42817^2 + 42558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3644478853 is a prime.

It is a super-2 number, since 2×3644478853² = 26564452219928391218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3644478853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3644478857) 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, 107190538 + ... + 107190571.

It is an arithmetic number, because the mean of its divisors is an integer number (964714995).

Almost surely, 2^3644478853 is an apocalyptic number.

It is an amenable number.

3644478853 is a deficient number, since it is larger than the sum of its proper divisors (214381127).

3644478853 is a wasteful number, since it uses less digits than its factorization.

3644478853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214381126.

The product of its digits is 7741440, while the sum is 52.

The square root of 3644478853 is about 60369.5192377743. The cubic root of 3644478853 is about 1538.9050029301.

The spelling of 3644478853 in words is "three billion, six hundred forty-four million, four hundred seventy-eight thousand, eight hundred fifty-three".