18779536890 has 96 divisors (see below), whose sum is σ = 49554513216. Its totient is φ = 4933405440.

The previous prime is 18779536879. The next prime is 18779536913. The reversal of 18779536890 is 9863597781.

18779536890 is a `hidden beast` number, since 1 + 8 + 7 + 7 + 9 + 536 + 8 + 90 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10057737 + ... + 10059603.

It is an arithmetic number, because the mean of its divisors is an integer number (516192846).

Almost surely, 2^18779536890 is an apocalyptic number.

18779536890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18779536890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24777256608).

18779536890 is an abundant number, since it is smaller than the sum of its proper divisors (30774976326).

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

18779536890 is a wasteful number, since it uses less digits than its factorization.

18779536890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3484 (or 3481 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 63.

The spelling of 18779536890 in words is "eighteen billion, seven hundred seventy-nine million, five hundred thirty-six thousand, eight hundred ninety".