9808121872 has 10 divisors (see below), whose sum is σ = 19003236158. Its totient is φ = 4904060928.

The previous prime is 9808121819. The next prime is 9808121887. The reversal of 9808121872 is 2781218089.

It can be written as a sum of positive squares in only one way, i.e., 8942350096 + 865771776 = 94564^2 + 29424^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306503793 + ... + 306503824.

Almost surely, 2^9808121872 is an apocalyptic number.

It is an amenable number.

9808121872 is a deficient number, since it is larger than the sum of its proper divisors (9195114286).

9808121872 is a wasteful number, since it uses less digits than its factorization.

9808121872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613007625 (or 613007619 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 9808121872 is about 99035.9625186730. The cubic root of 9808121872 is about 2140.5659748534.

The spelling of 9808121872 in words is "nine billion, eight hundred eight million, one hundred twenty-one thousand, eight hundred seventy-two".