8001621228 has 12 divisors (see below), whose sum is σ = 18670449560. Its totient is φ = 2667207072.

The previous prime is 8001621211. The next prime is 8001621269. The reversal of 8001621228 is 8221261008.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 8001621195 and 8001621204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333400873 + ... + 333400896.

Almost surely, 2^8001621228 is an apocalyptic number.

It is an amenable number.

8001621228 is an abundant number, since it is smaller than the sum of its proper divisors (10668828332).

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

8001621228 is a wasteful number, since it uses less digits than its factorization.

8001621228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666801776 (or 666801774 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 8001621228 is about 89451.7815809165. The cubic root of 8001621228 is about 2000.1350932080.

The spelling of 8001621228 in words is "eight billion, one million, six hundred twenty-one thousand, two hundred twenty-eight".