127785505 has 4 divisors (see below), whose sum is σ = 153342612. Its totient is φ = 102228400.

The previous prime is 127785487. The next prime is 127785509. The reversal of 127785505 is 505587721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505587721 = 37 ⋅13664533.

It can be written as a sum of positive squares in 2 ways, for example, as 58629649 + 69155856 = 7657^2 + 8316^2 .

It is not a de Polignac number, because 127785505 - 2⁵ = 127785473 is a prime.

It is a super-3 number, since 3×127785505³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127785509) 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, 12778546 + ... + 12778555.

It is an arithmetic number, because the mean of its divisors is an integer number (38335653).

Almost surely, 2^127785505 is an apocalyptic number.

It is an amenable number.

127785505 is a deficient number, since it is larger than the sum of its proper divisors (25557107).

127785505 is an equidigital number, since it uses as much as digits as its factorization.

127785505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25557106.

The product of its (nonzero) digits is 98000, while the sum is 40.

The square root of 127785505 is about 11304.2250950695. The cubic root of 127785505 is about 503.6867555195.

The spelling of 127785505 in words is "one hundred twenty-seven million, seven hundred eighty-five thousand, five hundred five".