27999553 has 2 divisors, whose sum is σ = 27999554. Its totient is φ = 27999552.

The previous prime is 27999551. The next prime is 27999577. The reversal of 27999553 is 35599972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24930049 + 3069504 = 4993^2 + 1752^2 .

It is a cyclic number.

It is not a de Polignac number, because 27999553 - 2¹ = 27999551 is a prime.

Together with 27999551, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 27999497 and 27999506.

It is not a weakly prime, because it can be changed into another prime (27999551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13999776 + 13999777.

It is an arithmetic number, because the mean of its divisors is an integer number (13999777).

Almost surely, 2^27999553 is an apocalyptic number.

It is an amenable number.

27999553 is a deficient number, since it is larger than the sum of its proper divisors (1).

27999553 is an equidigital number, since it uses as much as digits as its factorization.

27999553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 765450, while the sum is 49.

The square root of 27999553 is about 5291.4603844307. The cubic root of 27999553 is about 303.6572812798.

The spelling of 27999553 in words is "twenty-seven million, nine hundred ninety-nine thousand, five hundred fifty-three".