9988858638 has 48 divisors (see below), whose sum is σ = 24852672000. Its totient is φ = 2867613840.

The previous prime is 9988858637. The next prime is 9988858639. The reversal of 9988858638 is 8368588899.

9988858638 is a `hidden beast` number, since 9 + 9 + 8 + 8 + 8 + 586 + 38 = 666.

It is an interprime number because it is at equal distance from previous prime (9988858637) and next prime (9988858639).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988858637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1323838 + ... + 1331361.

It is an arithmetic number, because the mean of its divisors is an integer number (517764000).

Almost surely, 2^9988858638 is an apocalyptic number.

9988858638 is an abundant number, since it is smaller than the sum of its proper divisors (14863813362).

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

9988858638 is a wasteful number, since it uses less digits than its factorization.

9988858638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655237 (or 2655234 counting only the distinct ones).

The product of its digits is 238878720, while the sum is 72.

The square root of 9988858638 is about 99944.2776651070. The cubic root of 9988858638 is about 2153.6342814773.

The spelling of 9988858638 in words is "nine billion, nine hundred eighty-eight million, eight hundred fifty-eight thousand, six hundred thirty-eight".