27770881 has 4 divisors (see below), whose sum is σ = 27809200. Its totient is φ = 27732564.

The previous prime is 27770851. The next prime is 27770903. The reversal of 27770881 is 18807772.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27770881 - 2⁵ = 27770849 is a prime.

It is a super-2 number, since 2×27770881² = 1542443663032322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27770801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18051 + ... + 19528.

It is an arithmetic number, because the mean of its divisors is an integer number (6952300).

It is a Proth number, since it is equal to 1695 ⋅ 2¹⁴ + 1 and 1695 < 2¹⁴.

Almost surely, 2^27770881 is an apocalyptic number.

It is an amenable number.

27770881 is a deficient number, since it is larger than the sum of its proper divisors (38319).

27770881 is an equidigital number, since it uses as much as digits as its factorization.

27770881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38318.

The product of its (nonzero) digits is 43904, while the sum is 40.

The square root of 27770881 is about 5269.8084405413. The cubic root of 27770881 is about 302.8283655102.

The spelling of 27770881 in words is "twenty-seven million, seven hundred seventy thousand, eight hundred eighty-one".