27638428 has 12 divisors (see below), whose sum is σ = 49547232. Its totient is φ = 13482080.

The previous prime is 27638423. The next prime is 27638441. The reversal of 27638428 is 82483672.

It is a super-3 number, since 3×27638428³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27638423) 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, 84100 + ... + 84427.

It is an arithmetic number, because the mean of its divisors is an integer number (4128936).

Almost surely, 2^27638428 is an apocalyptic number.

It is an amenable number.

27638428 is a deficient number, since it is larger than the sum of its proper divisors (21908804).

27638428 is a wasteful number, since it uses less digits than its factorization.

27638428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168572 (or 168570 counting only the distinct ones).

The product of its digits is 129024, while the sum is 40.

The square root of 27638428 is about 5257.2262648663. The cubic root of 27638428 is about 302.3461522169.

The spelling of 27638428 in words is "twenty-seven million, six hundred thirty-eight thousand, four hundred twenty-eight".