9894774990 has 64 divisors (see below), whose sum is σ = 24609484800. Its totient is φ = 2543493120.

The previous prime is 9894774943. The next prime is 9894774997. The reversal of 9894774990 is 994774989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9894774997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218311 + ... + 259709.

It is an arithmetic number, because the mean of its divisors is an integer number (384523200).

Almost surely, 2^9894774990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9894774990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12304742400).

9894774990 is an abundant number, since it is smaller than the sum of its proper divisors (14714709810).

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

9894774990 is a wasteful number, since it uses less digits than its factorization.

9894774990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41697.

The product of its (nonzero) digits is 41150592, while the sum is 66.

The square root of 9894774990 is about 99472.4835821445. The cubic root of 9894774990 is about 2146.8513485399.

The spelling of 9894774990 in words is "nine billion, eight hundred ninety-four million, seven hundred seventy-four thousand, nine hundred ninety".