9900781700 has 18 divisors (see below), whose sum is σ = 21484696506. Its totient is φ = 3960312640.

The previous prime is 9900781699. The next prime is 9900781739. The reversal of 9900781700 is 71870099.

It can be written as a sum of positive squares in 3 ways, for example, as 697065604 + 9203716096 = 26402^2 + 95936^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49503809 + ... + 49504008.

Almost surely, 2^9900781700 is an apocalyptic number.

It is an amenable number.

9900781700 is an abundant number, since it is smaller than the sum of its proper divisors (11583914806).

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

9900781700 is a wasteful number, since it uses less digits than its factorization.

9900781700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99007831 (or 99007824 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 9900781700 is about 99502.6718234239. The cubic root of 9900781700 is about 2147.2856823141.

The spelling of 9900781700 in words is "nine billion, nine hundred million, seven hundred eighty-one thousand, seven hundred".