191828138820 has 48 divisors (see below), whose sum is σ = 540119482560. Its totient is φ = 50868390016.

The previous prime is 191828138819. The next prime is 191828138857. The reversal of 191828138820 is 28831828191.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8919807 + ... + 8941286.

It is an arithmetic number, because the mean of its divisors is an integer number (11252489220).

Almost surely, 2^191828138820 is an apocalyptic number.

191828138820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191828138820 is an abundant number, since it is smaller than the sum of its proper divisors (348291343740).

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

191828138820 is a wasteful number, since it uses less digits than its factorization.

191828138820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17861284 (or 17861282 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 51.

The spelling of 191828138820 in words is "one hundred ninety-one billion, eight hundred twenty-eight million, one hundred thirty-eight thousand, eight hundred twenty".