27828991398 has 64 divisors (see below), whose sum is σ = 63563512320. Its totient is φ = 8046592512.

The previous prime is 27828991363. The next prime is 27828991409. The reversal of 27828991398 is 89319982872.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 857911 + ... + 889757.

It is an arithmetic number, because the mean of its divisors is an integer number (993179880).

Almost surely, 2^27828991398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27828991398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31781756160).

27828991398 is an abundant number, since it is smaller than the sum of its proper divisors (35734520922).

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

27828991398 is a wasteful number, since it uses less digits than its factorization.

27828991398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32541.

The product of its digits is 31352832, while the sum is 66.

The spelling of 27828991398 in words is "twenty-seven billion, eight hundred twenty-eight million, nine hundred ninety-one thousand, three hundred ninety-eight".