9888820 has 12 divisors (see below), whose sum is σ = 20766564. Its totient is φ = 3955520.

The previous prime is 9888817. The next prime is 9888841. The reversal of 9888820 is 288889.

It can be written as a sum of positive squares in 2 ways, for example, as 5579044 + 4309776 = 2362^2 + 2076^2 .

It is an Ulam number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247201 + ... + 247240.

It is an arithmetic number, because the mean of its divisors is an integer number (1730547).

Almost surely, 2^9888820 is an apocalyptic number.

It is an amenable number.

9888820 is an abundant number, since it is smaller than the sum of its proper divisors (10877744).

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

9888820 is a wasteful number, since it uses less digits than its factorization.

9888820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494450 (or 494448 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 43.

The square root of 9888820 is about 3144.6494240217. The cubic root of 9888820 is about 214.6420580992.

The spelling of 9888820 in words is "nine million, eight hundred eighty-eight thousand, eight hundred twenty".