8897633721 has 12 divisors (see below), whose sum is σ = 12862854420. Its totient is φ = 5926809600.

The previous prime is 8897633711. The next prime is 8897633887. The reversal of 8897633721 is 1273367988.

8897633721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1986039225 + 6911594496 = 44565^2 + 83136^2 .

It is not a de Polignac number, because 8897633721 - 2²⁷ = 8763415993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8897633711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 400776 + ... + 422393.

It is an arithmetic number, because the mean of its divisors is an integer number (1071904535).

Almost surely, 2^8897633721 is an apocalyptic number.

It is an amenable number.

8897633721 is a deficient number, since it is larger than the sum of its proper divisors (3965220699).

8897633721 is a wasteful number, since it uses less digits than its factorization.

8897633721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824376 (or 824373 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 8897633721 is about 94327.2692332392. The cubic root of 8897633721 is about 2072.1674203236.

The spelling of 8897633721 in words is "eight billion, eight hundred ninety-seven million, six hundred thirty-three thousand, seven hundred twenty-one".