9896781558 has 32 divisors (see below), whose sum is σ = 20528980992. Its totient is φ = 3177367200.

The previous prime is 9896781551. The next prime is 9896781563. The reversal of 9896781558 is 8551876989.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9896781551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86841 + ... + 165332.

It is an arithmetic number, because the mean of its divisors is an integer number (641530656).

Almost surely, 2^9896781558 is an apocalyptic number.

9896781558 is an abundant number, since it is smaller than the sum of its proper divisors (10632199434).

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

9896781558 is a wasteful number, since it uses less digits than its factorization.

9896781558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252420.

The product of its digits is 43545600, while the sum is 66.

The square root of 9896781558 is about 99482.5691164035. The cubic root of 9896781558 is about 2146.9964592022.

The spelling of 9896781558 in words is "nine billion, eight hundred ninety-six million, seven hundred eighty-one thousand, five hundred fifty-eight".