127680565 has 4 divisors (see below), whose sum is σ = 153216684. Its totient is φ = 102144448.

The previous prime is 127680563. The next prime is 127680569. The reversal of 127680565 is 565086721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22638564 + 105042001 = 4758^2 + 10249^2 .

It is a cyclic number.

It is not a de Polignac number, because 127680565 - 2¹ = 127680563 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 (127680563) 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, 12768052 + ... + 12768061.

It is an arithmetic number, because the mean of its divisors is an integer number (38304171).

Almost surely, 2^127680565 is an apocalyptic number.

It is an amenable number.

127680565 is a deficient number, since it is larger than the sum of its proper divisors (25536119).

127680565 is an equidigital number, since it uses as much as digits as its factorization.

127680565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25536118.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 127680565 is about 11299.5825144118. The cubic root of 127680565 is about 503.5488385631.

The spelling of 127680565 in words is "one hundred twenty-seven million, six hundred eighty thousand, five hundred sixty-five".