3643228261 has 8 divisors (see below), whose sum is σ = 3686097240. Its totient is φ = 3600402432.

The previous prime is 3643228243. The next prime is 3643228271. The reversal of 3643228261 is 1628223463.

It can be written as a sum of positive squares in 4 ways, for example, as 240839361 + 3402388900 = 15519^2 + 58330^2 .

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 3643228261 - 2¹³ = 3643220069 is a prime.

It is a super-2 number, since 2×3643228261² = 26546224323498168242, 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 3643228261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643228201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178371 + ... + 197743.

It is an arithmetic number, because the mean of its divisors is an integer number (460762155).

Almost surely, 2^3643228261 is an apocalyptic number.

It is an amenable number.

3643228261 is a deficient number, since it is larger than the sum of its proper divisors (42868979).

3643228261 is a wasteful number, since it uses less digits than its factorization.

3643228261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21575.

The product of its digits is 82944, while the sum is 37.

The square root of 3643228261 is about 60359.1605392255. The cubic root of 3643228261 is about 1538.7289592451.

The spelling of 3643228261 in words is "three billion, six hundred forty-three million, two hundred twenty-eight thousand, two hundred sixty-one".