18990771731028 has 192 divisors, whose sum is σ = 52594707110400. Its totient is φ = 5986988992512.

The previous prime is 18990771731017. The next prime is 18990771731081. The reversal of 18990771731028 is 82013717709981.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17376900 + ... + 18437412.

It is an arithmetic number, because the mean of its divisors is an integer number (273930766200).

Almost surely, 2^{18990771731028} is an apocalyptic number.

18990771731028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18990771731028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26297353555200).

18990771731028 is an abundant number, since it is smaller than the sum of its proper divisors (33603935379372).

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

18990771731028 is a wasteful number, since it uses less digits than its factorization.

18990771731028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060650 (or 1060630 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 63.

The spelling of 18990771731028 in words is "eighteen trillion, nine hundred ninety billion, seven hundred seventy-one million, seven hundred thirty-one thousand, twenty-eight".