127776565 has 12 divisors (see below), whose sum is σ = 178365996. Its totient is φ = 87618048.

The previous prime is 127776563. The next prime is 127776599. The reversal of 127776565 is 565677721.

It can be written as a sum of positive squares in 2 ways, for example, as 76195441 + 51581124 = 8729^2 + 7182^2 .

It is not a de Polignac number, because 127776565 - 2¹ = 127776563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127776563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260524 + ... + 261013.

It is an arithmetic number, because the mean of its divisors is an integer number (14863833).

Almost surely, 2^127776565 is an apocalyptic number.

It is an amenable number.

127776565 is a deficient number, since it is larger than the sum of its proper divisors (50589431).

127776565 is an equidigital number, since it uses as much as digits as its factorization.

127776565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521556 (or 521549 counting only the distinct ones).

The product of its digits is 617400, while the sum is 46.

The square root of 127776565 is about 11303.8296607831. The cubic root of 127776565 is about 503.6750091048.

The spelling of 127776565 in words is "one hundred twenty-seven million, seven hundred seventy-six thousand, five hundred sixty-five".