27998705 has 16 divisors (see below), whose sum is σ = 40068864. Its totient is φ = 18363840.

The previous prime is 27998671. The next prime is 27998713. The reversal of 27998705 is 50789972.

It is not a de Polignac number, because 27998705 - 2¹² = 27994609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27998705.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16586 + ... + 18195.

It is an arithmetic number, because the mean of its divisors is an integer number (2504304).

Almost surely, 2^27998705 is an apocalyptic number.

It is an amenable number.

27998705 is a deficient number, since it is larger than the sum of its proper divisors (12070159).

27998705 is a wasteful number, since it uses less digits than its factorization.

27998705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34816.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 27998705 is about 5291.3802547162. The cubic root of 27998705 is about 303.6542157074.

The spelling of 27998705 in words is "twenty-seven million, nine hundred ninety-eight thousand, seven hundred five".