8728820 has 24 divisors (see below), whose sum is σ = 19409544. Its totient is φ = 3286016.

The previous prime is 8728807. The next prime is 8728823. The reversal of 8728820 is 288278.

8728820 is digitally balanced in base 5, 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 3290596 + 5438224 = 1814^2 + 2332^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8728823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12497 + ... + 13176.

It is an arithmetic number, because the mean of its divisors is an integer number (808731).

Almost surely, 2^8728820 is an apocalyptic number.

It is an amenable number.

8728820 is an abundant number, since it is smaller than the sum of its proper divisors (10680724).

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

8728820 is a wasteful number, since it uses less digits than its factorization.

8728820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25699 (or 25697 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 8728820 is about 2954.4576490449. The cubic root of 8728820 is about 205.8978662340.

The spelling of 8728820 in words is "eight million, seven hundred twenty-eight thousand, eight hundred twenty".