9806811840 has 168 divisors, whose sum is σ = 38550189600. Its totient is φ = 2241552384.

The previous prime is 9806811809. The next prime is 9806811869. The reversal of 9806811840 is 481186089.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 223065 + ... + 263384.

Almost surely, 2^9806811840 is an apocalyptic number.

9806811840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9806811840 is an abundant number, since it is smaller than the sum of its proper divisors (28743377760).

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

9806811840 is a wasteful number, since it uses less digits than its factorization.

9806811840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486479 (or 486466 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 9806811840 is about 99029.3483771351. The cubic root of 9806811840 is about 2140.4706683030.

The spelling of 9806811840 in words is "nine billion, eight hundred six million, eight hundred eleven thousand, eight hundred forty".