27797155 has 4 divisors (see below), whose sum is σ = 33356592. Its totient is φ = 22237720.

The previous prime is 27797153. The next prime is 27797183. The reversal of 27797155 is 55179772.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 27797155 - 2¹ = 27797153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27797153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2779711 + ... + 2779720.

It is an arithmetic number, because the mean of its divisors is an integer number (8339148).

Almost surely, 2^27797155 is an apocalyptic number.

27797155 is a deficient number, since it is larger than the sum of its proper divisors (5559437).

27797155 is an equidigital number, since it uses as much as digits as its factorization.

27797155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5559436.

The product of its digits is 154350, while the sum is 43.

The square root of 27797155 is about 5272.3007311799. The cubic root of 27797155 is about 302.9238372692.

The spelling of 27797155 in words is "twenty-seven million, seven hundred ninety-seven thousand, one hundred fifty-five".