27138428 has 12 divisors (see below), whose sum is σ = 47537952. Its totient is φ = 13556160.

The previous prime is 27138421. The next prime is 27138437. The reversal of 27138428 is 82483172.

It is a super-2 number, since 2×27138428² = 1472988548622368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27138421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2573 + ... + 7803.

It is an arithmetic number, because the mean of its divisors is an integer number (3961496).

Almost surely, 2^27138428 is an apocalyptic number.

It is an amenable number.

27138428 is a deficient number, since it is larger than the sum of its proper divisors (20399524).

27138428 is a wasteful number, since it uses less digits than its factorization.

27138428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6532 (or 6530 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 27138428 is about 5209.4556337491. The cubic root of 27138428 is about 300.5118225918.

The spelling of 27138428 in words is "twenty-seven million, one hundred thirty-eight thousand, four hundred twenty-eight".