27784555969 has 27 divisors (see below), whose sum is σ = 30407758209. Its totient is φ = 25383096360.

The previous prime is 27784555961. The next prime is 27784555987. The reversal of 27784555969 is 96955548772.

The square root of 27784555969 is 166687.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 27784555969 - 2³ = 27784555961 is a prime.

It is a super-2 number, since 2×27784555969² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27784555961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 98178502 + ... + 98178784.

It is an arithmetic number, because the mean of its divisors is an integer number (1126213267).

Almost surely, 2^27784555969 is an apocalyptic number.

27784555969 is the 166687-th square number.

27784555969 is the 83344-th centered octagonal number.

It is an amenable number.

27784555969 is a deficient number, since it is larger than the sum of its proper divisors (2623202240).

27784555969 is an frugal number, since it uses more digits than its factorization.

27784555969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 333 counting only the distinct ones).

The product of its digits is 190512000, while the sum is 67.

The spelling of 27784555969 in words is "twenty-seven billion, seven hundred eighty-four million, five hundred fifty-five thousand, nine hundred sixty-nine".