8721800 has 24 divisors (see below), whose sum is σ = 20278650. Its totient is φ = 3488640.

The previous prime is 8721773. The next prime is 8721851. The reversal of 8721800 is 81278.

It can be written as a sum of positive squares in 3 ways, for example, as 4218916 + 4502884 = 2054^2 + 2122^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8721800.

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, 21605 + ... + 22004.

Almost surely, 2^8721800 is an apocalyptic number.

It is an amenable number.

8721800 is an abundant number, since it is smaller than the sum of its proper divisors (11556850).

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

8721800 is a wasteful number, since it uses less digits than its factorization.

8721800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43625 (or 43616 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 8721800 is about 2953.2693747777. The cubic root of 8721800 is about 205.8426548509.

The spelling of 8721800 in words is "eight million, seven hundred twenty-one thousand, eight hundred".