127887057769 has 3 divisors (see below), whose sum is σ = 127887415383. Its totient is φ = 127886700156.

The previous prime is 127887057673. The next prime is 127887057833. The reversal of 127887057769 is 967750788721.

The square root of 127887057769 is 357613.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 967750788721 = 797 ⋅1214241893.

It can be written as a sum of positive squares in only one way, i.e., 127874184025 + 12873744 = 357595^2 + 3588^2 .

It is a de Polignac number, because none of the positive numbers 2^k-127887057769 is a prime.

It is a super-2 number, since 2×127887057769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127887057569) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 178807 + ... + 536419.

It is an arithmetic number, because the mean of its divisors is an integer number (42629138461).

Almost surely, 2^127887057769 is an apocalyptic number.

127887057769 is the 357613-rd square number.

127887057769 is the 178807-th centered octagonal number.

It is an amenable number.

127887057769 is a deficient number, since it is larger than the sum of its proper divisors (357614).

127887057769 is an frugal number, since it uses more digits than its factorization.

127887057769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715226 (or 357613 counting only the distinct ones).

The product of its (nonzero) digits is 82978560, while the sum is 67.

The spelling of 127887057769 in words is "one hundred twenty-seven billion, eight hundred eighty-seven million, fifty-seven thousand, seven hundred sixty-nine".