9871806144 has 28 divisors (see below), whose sum is σ = 26119154264. Its totient is φ = 3290601984.

The previous prime is 9871806097. The next prime is 9871806151. The reversal of 9871806144 is 4416081789.

It is a super-2 number, since 2×9871806144² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 9871806093 and 9871806102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25707637 + ... + 25708020.

It is an arithmetic number, because the mean of its divisors is an integer number (932826938).

Almost surely, 2^9871806144 is an apocalyptic number.

It is an amenable number.

9871806144 is an abundant number, since it is smaller than the sum of its proper divisors (16247348120).

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

9871806144 is a wasteful number, since it uses less digits than its factorization.

9871806144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51415672 (or 51415662 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 9871806144 is about 99356.9632386176. The cubic root of 9871806144 is about 2145.1888919238.

The spelling of 9871806144 in words is "nine billion, eight hundred seventy-one million, eight hundred six thousand, one hundred forty-four".