3638250621 has 8 divisors (see below), whose sum is σ = 5390000960. Its totient is φ = 2425500396.

The previous prime is 3638250601. The next prime is 3638250659. The reversal of 3638250621 is 1260528363.

It is a happy number.

3638250621 is a `hidden beast` number, since 3 + 6 + 3 + 8 + 25 + 0 + 621 = 666.

It is not a de Polignac number, because 3638250621 - 2¹⁰ = 3638249597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3638250601) 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 7 ways as a sum of consecutive naturals, for example, 67374985 + ... + 67375038.

It is an arithmetic number, because the mean of its divisors is an integer number (673750120).

Almost surely, 2^3638250621 is an apocalyptic number.

It is an amenable number.

3638250621 is a deficient number, since it is larger than the sum of its proper divisors (1751750339).

3638250621 is a wasteful number, since it uses less digits than its factorization.

3638250621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134750032 (or 134750026 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 3638250621 is about 60317.9129363741. The cubic root of 3638250621 is about 1538.0278658633.

Adding to 3638250621 its reverse (1260528363), we get a palindrome (4898778984).

The spelling of 3638250621 in words is "three billion, six hundred thirty-eight million, two hundred fifty thousand, six hundred twenty-one".