8808721 has 4 divisors (see below), whose sum is σ = 9112500. Its totient is φ = 8504944.

The previous prime is 8808673. The next prime is 8808733. The reversal of 8808721 is 1278088.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6558721 + 2250000 = 2561^2 + 1500^2 .

It is a cyclic number.

It is not a de Polignac number, because 8808721 - 2¹³ = 8800529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8808781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151846 + ... + 151903.

It is an arithmetic number, because the mean of its divisors is an integer number (2278125).

Almost surely, 2^8808721 is an apocalyptic number.

It is an amenable number.

8808721 is a deficient number, since it is larger than the sum of its proper divisors (303779).

8808721 is a wasteful number, since it uses less digits than its factorization.

8808721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303778.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 8808721 is about 2967.9489550867. The cubic root of 8808721 is about 206.5242014445.

The spelling of 8808721 in words is "eight million, eight hundred eight thousand, seven hundred twenty-one".