27912919398 has 128 divisors (see below), whose sum is σ = 71302533120. Its totient is φ = 7085352960.

The previous prime is 27912919387. The next prime is 27912919417. The reversal of 27912919398 is 89391921972.

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 5333443 + ... + 5338673.

It is an arithmetic number, because the mean of its divisors is an integer number (557051040).

Almost surely, 2^27912919398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27912919398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35651266560).

27912919398 is an abundant number, since it is smaller than the sum of its proper divisors (43389613722).

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

27912919398 is a wasteful number, since it uses less digits than its factorization.

27912919398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5622.

The product of its digits is 4408992, while the sum is 60.

The spelling of 27912919398 in words is "twenty-seven billion, nine hundred twelve million, nine hundred nineteen thousand, three hundred ninety-eight".