27998617 has 2 divisors, whose sum is σ = 27998618. Its totient is φ = 27998616.

The previous prime is 27998591. The next prime is 27998651. The reversal of 27998617 is 71689972.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 7241481 = 4556^2 + 2691^2 .

It is a cyclic number.

It is not a de Polignac number, because 27998617 - 2¹⁵ = 27965849 is a prime.

It is a super-3 number, since 3×27998617³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (27998017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13999308 + 13999309.

It is an arithmetic number, because the mean of its divisors is an integer number (13999309).

Almost surely, 2^27998617 is an apocalyptic number.

It is an amenable number.

27998617 is a deficient number, since it is larger than the sum of its proper divisors (1).

27998617 is an equidigital number, since it uses as much as digits as its factorization.

27998617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 49.

The square root of 27998617 is about 5291.3719392989. The cubic root of 27998617 is about 303.6538975784.

The spelling of 27998617 in words is "twenty-seven million, nine hundred ninety-eight thousand, six hundred seventeen".