27820138 has 4 divisors (see below), whose sum is σ = 41730210. Its totient is φ = 13910068.

The previous prime is 27820127. The next prime is 27820141. The reversal of 27820138 is 83102872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 7144929 = 4547^2 + 2673^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6955033 + ... + 6955036.

Almost surely, 2^27820138 is an apocalyptic number.

27820138 is a deficient number, since it is larger than the sum of its proper divisors (13910072).

27820138 is a wasteful number, since it uses less digits than its factorization.

27820138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13910071.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 27820138 is about 5274.4798795711. The cubic root of 27820138 is about 303.0073012143.

The spelling of 27820138 in words is "twenty-seven million, eight hundred twenty thousand, one hundred thirty-eight".