27898611138 has 80 divisors (see below), whose sum is σ = 64710226944. Its totient is φ = 8974437120.

The previous prime is 27898611133. The next prime is 27898611151. The reversal of 27898611138 is 83111689872.

27898611138 is a `hidden beast` number, since 2 + 7 + 8 + 9 + 8 + 611 + 13 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (27898611131) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1835506 + ... + 1850642.

Almost surely, 2^27898611138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27898611138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32355113472).

27898611138 is an abundant number, since it is smaller than the sum of its proper divisors (36811615806).

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

27898611138 is a wasteful number, since it uses less digits than its factorization.

27898611138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15549 (or 15540 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The spelling of 27898611138 in words is "twenty-seven billion, eight hundred ninety-eight million, six hundred eleven thousand, one hundred thirty-eight".