9991438060 has 24 divisors (see below), whose sum is σ = 21029833440. Its totient is φ = 3987467904.

The previous prime is 9991438031. The next prime is 9991438103. The reversal of 9991438060 is 608341999.

It is a junction number, because it is equal to n+sod(n) for n = 9991437995 and 9991438013.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560209 + ... + 577768.

It is an arithmetic number, because the mean of its divisors is an integer number (876243060).

Almost surely, 2^9991438060 is an apocalyptic number.

It is an amenable number.

9991438060 is an abundant number, since it is smaller than the sum of its proper divisors (11038395380).

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

9991438060 is a wasteful number, since it uses less digits than its factorization.

9991438060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138425 (or 1138423 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 9991438060 is about 99957.1811327230. The cubic root of 9991438060 is about 2153.8196431136.

The spelling of 9991438060 in words is "nine billion, nine hundred ninety-one million, four hundred thirty-eight thousand, sixty".