18850171428 has 72 divisors (see below), whose sum is σ = 52038342720. Its totient is φ = 5705847360.

The previous prime is 18850171423. The next prime is 18850171451. The reversal of 18850171428 is 82417105881.

18850171428 is a `hidden beast` number, since 1 + 8 + 8 + 50 + 171 + 428 = 666.

It is not an unprimeable number, because it can be changed into a prime (18850171423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 338026 + ... + 389822.

It is an arithmetic number, because the mean of its divisors is an integer number (722754760).

Almost surely, 2^18850171428 is an apocalyptic number.

18850171428 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 18850171428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26019171360).

18850171428 is an abundant number, since it is smaller than the sum of its proper divisors (33188171292).

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

18850171428 is a wasteful number, since it uses less digits than its factorization.

18850171428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52737 (or 52732 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The spelling of 18850171428 in words is "eighteen billion, eight hundred fifty million, one hundred seventy-one thousand, four hundred twenty-eight".