27789138 has 24 divisors (see below), whose sum is σ = 64841868. Its totient is φ = 8550432.

The previous prime is 27789133. The next prime is 27789143. The reversal of 27789138 is 83198772.

It is an interprime number because it is at equal distance from previous prime (27789133) and next prime (27789143).

It can be written as a sum of positive squares in 2 ways, for example, as 22439169 + 5349969 = 4737^2 + 2313^2 .

It is a junction number, because it is equal to n+sod(n) for n = 27789093 and 27789102.

It is not an unprimeable number, because it can be changed into a prime (27789133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59145 + ... + 59612.

Almost surely, 2^27789138 is an apocalyptic number.

27789138 is an abundant number, since it is smaller than the sum of its proper divisors (37052730).

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

27789138 is a wasteful number, since it uses less digits than its factorization.

27789138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118778 (or 118775 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 27789138 is about 5271.5403820895. The cubic root of 27789138 is about 302.8947122993.

The spelling of 27789138 in words is "twenty-seven million, seven hundred eighty-nine thousand, one hundred thirty-eight".