27799155 has 12 divisors (see below), whose sum is σ = 48185280. Its totient is φ = 14826192.

The previous prime is 27799153. The next prime is 27799159. The reversal of 27799155 is 55199772.

It is not a de Polignac number, because 27799155 - 2¹ = 27799153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 617759 = 27799155 / (2 + 7 + 7 + 9 + 9 + 1 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 27799155.

It is not an unprimeable number, because it can be changed into a prime (27799151) 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 in 11 ways as a sum of consecutive naturals, for example, 308835 + ... + 308924.

It is an arithmetic number, because the mean of its divisors is an integer number (4015440).

Almost surely, 2^27799155 is an apocalyptic number.

27799155 is a deficient number, since it is larger than the sum of its proper divisors (20386125).

27799155 is a wasteful number, since it uses less digits than its factorization.

27799155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617770 (or 617767 counting only the distinct ones).

The product of its digits is 198450, while the sum is 45.

The square root of 27799155 is about 5272.4903982843. The cubic root of 27799155 is about 302.9311021991.

The spelling of 27799155 in words is "twenty-seven million, seven hundred ninety-nine thousand, one hundred fifty-five".