27399491584 has 52 divisors (see below), whose sum is σ = 55408674780. Its totient is φ = 13545635840.

The previous prime is 27399491569. The next prime is 27399491599. The reversal of 27399491584 is 48519499372.

It is an interprime number because it is at equal distance from previous prime (27399491569) and next prime (27399491599).

It can be written as a sum of positive squares in 2 ways, for example, as 7212765184 + 20186726400 = 84928^2 + 142080^2 .

It is a Smith number, since the sum of its digits (61) 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 3 ways as a sum of consecutive naturals, for example, 326964 + ... + 402124.

Almost surely, 2^27399491584 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27399491584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27704337390).

27399491584 is an abundant number, since it is smaller than the sum of its proper divisors (28009183196).

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

27399491584 is an frugal number, since it uses more digits than its factorization.

27399491584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75274 (or 75252 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 61.

The spelling of 27399491584 in words is "twenty-seven billion, three hundred ninety-nine million, four hundred ninety-one thousand, five hundred eighty-four".