3643208881 has 9 divisors (see below), whose sum is σ = 3945863019. Its totient is φ = 3362237736.

The previous prime is 3643208879. The next prime is 3643208887. The reversal of 3643208881 is 1888023463.

The square root of 3643208881 is 60359.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 538936225 + 3104272656 = 23215^2 + 55716^2 .

It is not a de Polignac number, because 3643208881 - 2¹ = 3643208879 is a prime.

It is a super-2 number, since 2×3643208881² = 26545941901194544322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3643208887) 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 8 ways as a sum of consecutive naturals, for example, 782346 + ... + 786988.

Almost surely, 2^3643208881 is an apocalyptic number.

3643208881 is the 60359-th square number.

3643208881 is the 30180-th centered octagonal number.

It is an amenable number.

3643208881 is a deficient number, since it is larger than the sum of its proper divisors (302654138).

3643208881 is an frugal number, since it uses more digits than its factorization.

3643208881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9312 (or 4656 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The cubic root of 3643208881 is about 1538.7262308389.

The spelling of 3643208881 in words is "three billion, six hundred forty-three million, two hundred eight thousand, eight hundred eighty-one".