27918890 has 16 divisors (see below), whose sum is σ = 50326920. Its totient is φ = 11151360.

The previous prime is 27918889. The next prime is 27918899. The reversal of 27918890 is 9881972.

It can be written as a sum of positive squares in 4 ways, for example, as 22363441 + 5555449 = 4729^2 + 2357^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27918899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7226 + ... + 10394.

Almost surely, 2^27918890 is an apocalyptic number.

27918890 is a deficient number, since it is larger than the sum of its proper divisors (22408030).

27918890 is a wasteful number, since it uses less digits than its factorization.

27918890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4057.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 27918890 is about 5283.8328891062. The cubic root of 27918890 is about 303.3654020222.

The spelling of 27918890 in words is "twenty-seven million, nine hundred eighteen thousand, eight hundred ninety".