8421920672 has 96 divisors (see below), whose sum is σ = 19025362944. Its totient is φ = 3632428800.

The previous prime is 8421920669. The next prime is 8421920693. The reversal of 8421920672 is 2760291248.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1024097 + ... + 1032287.

It is an arithmetic number, because the mean of its divisors is an integer number (198180864).

Almost surely, 2^8421920672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8421920672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9512681472).

8421920672 is an abundant number, since it is smaller than the sum of its proper divisors (10603442272).

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

8421920672 is a wasteful number, since it uses less digits than its factorization.

8421920672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8362 (or 8354 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 8421920672 is about 91771.0230519416. The cubic root of 8421920672 is about 2034.5594389052.

The spelling of 8421920672 in words is "eight billion, four hundred twenty-one million, nine hundred twenty thousand, six hundred seventy-two".