8638211644 has 12 divisors (see below), whose sum is σ = 15342495784. Its totient is φ = 4254641424.

The previous prime is 8638211633. The next prime is 8638211671. The reversal of 8638211644 is 4461128368.

It is a self number, because there is not a number n which added to its sum of digits gives 8638211644.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16115799 + ... + 16116334.

Almost surely, 2^8638211644 is an apocalyptic number.

It is an amenable number.

8638211644 is a deficient number, since it is larger than the sum of its proper divisors (6704284140).

8638211644 is a wasteful number, since it uses less digits than its factorization.

8638211644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32232204 (or 32232202 counting only the distinct ones).

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

The square root of 8638211644 is about 92941.9799875169. The cubic root of 8638211644 is about 2051.8295500510.

The spelling of 8638211644 in words is "eight billion, six hundred thirty-eight million, two hundred eleven thousand, six hundred forty-four".