8890694721 has 24 divisors (see below), whose sum is σ = 13092095016. Its totient is φ = 5811886080.

The previous prime is 8890694713. The next prime is 8890694737. The reversal of 8890694721 is 1274960988.

8890694721 is a `hidden beast` number, since 88 + 90 + 6 + 9 + 472 + 1 = 666.

8890694721 is digitally balanced in base 3, 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 4 ways, for example, as 341843121 + 8548851600 = 18489^2 + 92460^2 .

It is not a de Polignac number, because 8890694721 - 2³ = 8890694713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8890694711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1003491 + ... + 1012311.

It is an arithmetic number, because the mean of its divisors is an integer number (545503959).

Almost surely, 2^8890694721 is an apocalyptic number.

It is an amenable number.

8890694721 is a deficient number, since it is larger than the sum of its proper divisors (4201400295).

8890694721 is a wasteful number, since it uses less digits than its factorization.

8890694721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10993 (or 10990 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 8890694721 is about 94290.4805428417. The cubic root of 8890694721 is about 2071.6286063101.

The spelling of 8890694721 in words is "eight billion, eight hundred ninety million, six hundred ninety-four thousand, seven hundred twenty-one".