8421896644 has 12 divisors (see below), whose sum is σ = 16843793344. Its totient is φ = 3609384264.

The previous prime is 8421896629. The next prime is 8421896647. The reversal of 8421896644 is 4466981248.

8421896644 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 8421896591 and 8421896600.

It is not an unprimeable number, because it can be changed into a prime (8421896647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150390984 + ... + 150391039.

Almost surely, 2^8421896644 is an apocalyptic number.

It is an amenable number.

8421896644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8421896644 is a wasteful number, since it uses less digits than its factorization.

8421896644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300782034 (or 300782032 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 52.

The square root of 8421896644 is about 91770.8921390655. The cubic root of 8421896644 is about 2034.5575040164.

The spelling of 8421896644 in words is "eight billion, four hundred twenty-one million, eight hundred ninety-six thousand, six hundred forty-four".