8828721 has 24 divisors (see below), whose sum is σ = 14006304. Its totient is φ = 5314560.

The previous prime is 8828719. The next prime is 8828723. The reversal of 8828721 is 1278288.

8828721 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8828719) and next prime (8828723).

It is not a de Polignac number, because 8828721 - 2¹ = 8828719 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8828723) 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, 25270 + ... + 25616.

It is an arithmetic number, because the mean of its divisors is an integer number (583596).

Almost surely, 2^8828721 is an apocalyptic number.

It is an amenable number.

8828721 is a deficient number, since it is larger than the sum of its proper divisors (5177583).

8828721 is a wasteful number, since it uses less digits than its factorization.

8828721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621 (or 618 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 8828721 is about 2971.3163749423. The cubic root of 8828721 is about 206.6803861282.

The spelling of 8828721 in words is "eight million, eight hundred twenty-eight thousand, seven hundred twenty-one".