3621206605 has 8 divisors (see below), whose sum is σ = 4377167352. Its totient is φ = 2875819008.

The previous prime is 3621206591. The next prime is 3621206621. The reversal of 3621206605 is 5066021263.

It can be written as a sum of positive squares in 4 ways, for example, as 43850884 + 3577355721 = 6622^2 + 59811^2 .

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 3621206605 - 2⁹ = 3621206093 is a prime.

It is a super-2 number, since 2×3621206605² = 26226274552191252050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2642532 + ... + 2643901.

It is an arithmetic number, because the mean of its divisors is an integer number (547145919).

Almost surely, 2^3621206605 is an apocalyptic number.

It is an amenable number.

3621206605 is a deficient number, since it is larger than the sum of its proper divisors (755960747).

3621206605 is a wasteful number, since it uses less digits than its factorization.

3621206605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286575.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 3621206605 is about 60176.4622173820. The cubic root of 3621206605 is about 1535.6223862244.

Adding to 3621206605 its reverse (5066021263), we get a palindrome (8687227868).

The spelling of 3621206605 in words is "three billion, six hundred twenty-one million, two hundred six thousand, six hundred five".