8447028621 has 32 divisors (see below), whose sum is σ = 11744833920. Its totient is φ = 5393606400.

The previous prime is 8447028613. The next prime is 8447028641. The reversal of 8447028621 is 1268207448.

It is not a de Polignac number, because 8447028621 - 2³ = 8447028613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8447028641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7727751 + ... + 7728843.

It is an arithmetic number, because the mean of its divisors is an integer number (367026060).

Almost surely, 2^8447028621 is an apocalyptic number.

It is an amenable number.

8447028621 is a deficient number, since it is larger than the sum of its proper divisors (3297805299).

8447028621 is a wasteful number, since it uses less digits than its factorization.

8447028621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757.

The product of its (nonzero) digits is 172032, while the sum is 42.

The square root of 8447028621 is about 91907.7179620950. The cubic root of 8447028621 is about 2036.5792843376.

The spelling of 8447028621 in words is "eight billion, four hundred forty-seven million, twenty-eight thousand, six hundred twenty-one".