127672561 has 4 divisors (see below), whose sum is σ = 128158272. Its totient is φ = 127186852.

The previous prime is 127672553. The next prime is 127672579. The reversal of 127672561 is 165276721.

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 127672561 - 2³ = 127672553 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 127672561.

It is not an unprimeable number, because it can be changed into a prime (127672861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242461 + ... + 242986.

It is an arithmetic number, because the mean of its divisors is an integer number (32039568).

Almost surely, 2^127672561 is an apocalyptic number.

It is an amenable number.

127672561 is a deficient number, since it is larger than the sum of its proper divisors (485711).

127672561 is an equidigital number, since it uses as much as digits as its factorization.

127672561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485710.

The product of its digits is 35280, while the sum is 37.

The square root of 127672561 is about 11299.2283364839. The cubic root of 127672561 is about 503.5383162383.

It can be divided in two parts, 1276 and 72561, that added together give a palindrome (73837).

The spelling of 127672561 in words is "one hundred twenty-seven million, six hundred seventy-two thousand, five hundred sixty-one".