9987298542 has 144 divisors (see below), whose sum is σ = 24442209792. Its totient is φ = 3042204480.

The previous prime is 9987298523. The next prime is 9987298543. The reversal of 9987298542 is 2458927899.

It is a happy number.

9987298542 is a `hidden beast` number, since 9 + 9 + 87 + 2 + 9 + 8 + 542 = 666.

It is a super-2 number, since 2×9987298542² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9987298542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987298543) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 21664192 + ... + 21664652.

It is an arithmetic number, because the mean of its divisors is an integer number (169737568).

Almost surely, 2^9987298542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9987298542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12221104896).

9987298542 is an abundant number, since it is smaller than the sum of its proper divisors (14454911250).

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

9987298542 is a wasteful number, since it uses less digits than its factorization.

9987298542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627 (or 606 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The square root of 9987298542 is about 99936.4725313036. The cubic root of 9987298542 is about 2153.5221548475.

The spelling of 9987298542 in words is "nine billion, nine hundred eighty-seven million, two hundred ninety-eight thousand, five hundred forty-two".