127968257 has 4 divisors (see below), whose sum is σ = 131089476. Its totient is φ = 124847040.

The previous prime is 127968233. The next prime is 127968283. The reversal of 127968257 is 752869721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752869721 = 2437 ⋅308933.

It can be written as a sum of positive squares in 2 ways, for example, as 18054001 + 109914256 = 4249^2 + 10484^2 .

It is a cyclic number.

It is not a de Polignac number, because 127968257 - 2¹⁶ = 127902721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127968157) 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, 1560548 + ... + 1560629.

It is an arithmetic number, because the mean of its divisors is an integer number (32772369).

Almost surely, 2^127968257 is an apocalyptic number.

It is an amenable number.

127968257 is a deficient number, since it is larger than the sum of its proper divisors (3121219).

127968257 is an equidigital number, since it uses as much as digits as its factorization.

127968257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3121218.

The product of its digits is 423360, while the sum is 47.

The square root of 127968257 is about 11312.3055563400. The cubic root of 127968257 is about 503.9267564367.

The spelling of 127968257 in words is "one hundred twenty-seven million, nine hundred sixty-eight thousand, two hundred fifty-seven".