8721828 has 18 divisors (see below), whose sum is σ = 22046934. Its totient is φ = 2907264.

The previous prime is 8721773. The next prime is 8721851. The reversal of 8721828 is 8281278.

It can be written as a sum of positive squares in only one way, i.e., 4848804 + 3873024 = 2202^2 + 1968^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 242273 = 8721828 / (8 + 7 + 2 + 1 + 8 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 8721792 and 8721801.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121101 + ... + 121172.

Almost surely, 2^8721828 is an apocalyptic number.

It is an amenable number.

8721828 is an abundant number, since it is smaller than the sum of its proper divisors (13325106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8721828 is a wasteful number, since it uses less digits than its factorization.

8721828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242283 (or 242278 counting only the distinct ones).

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

The square root of 8721828 is about 2953.2741152829. The cubic root of 8721828 is about 205.8428751261.

The spelling of 8721828 in words is "eight million, seven hundred twenty-one thousand, eight hundred twenty-eight".