127892991487 has 8 divisors (see below), whose sum is σ = 129504720800. Its totient is φ = 126288378720.

The previous prime is 127892991427. The next prime is 127892991493. The reversal of 127892991487 is 784199298721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127892991487 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 (127892991407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1742964 + ... + 1814857.

It is an arithmetic number, because the mean of its divisors is an integer number (16188090100).

Almost surely, 2^127892991487 is an apocalyptic number.

127892991487 is a deficient number, since it is larger than the sum of its proper divisors (1611729313).

127892991487 is a wasteful number, since it uses less digits than its factorization.

127892991487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558273.

The product of its digits is 36578304, while the sum is 67.

The spelling of 127892991487 in words is "one hundred twenty-seven billion, eight hundred ninety-two million, nine hundred ninety-one thousand, four hundred eighty-seven".