9948687138 has 80 divisors (see below), whose sum is σ = 24160946040. Its totient is φ = 3041535744.

The previous prime is 9948687103. The next prime is 9948687139. The reversal of 9948687138 is 8317868499.

9948687138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5834362689 + 4114324449 = 76383^2 + 64143^2 .

It is not an unprimeable number, because it can be changed into a prime (9948687139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 315598 + ... + 345686.

Almost surely, 2^9948687138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9948687138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12080473020).

9948687138 is an abundant number, since it is smaller than the sum of its proper divisors (14212258902).

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

9948687138 is a wasteful number, since it uses less digits than its factorization.

9948687138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30273 (or 30264 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The square root of 9948687138 is about 99743.1057166359. The cubic root of 9948687138 is about 2150.7433620625.

It can be divided in two parts, 99486 and 87138, that added together give a square (186624 = 432²).

The spelling of 9948687138 in words is "nine billion, nine hundred forty-eight million, six hundred eighty-seven thousand, one hundred thirty-eight".