128877857 has 2 divisors, whose sum is σ = 128877858. Its totient is φ = 128877856.

The previous prime is 128877787. The next prime is 128877863. The reversal of 128877857 is 758778821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91374481 + 37503376 = 9559^2 + 6124^2 .

It is a cyclic number.

It is not a de Polignac number, because 128877857 - 2⁸ = 128877601 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 128877799 and 128877808.

It is not a weakly prime, because it can be changed into another prime (128877887) 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 as a sum of consecutive naturals, namely, 64438928 + 64438929.

It is an arithmetic number, because the mean of its divisors is an integer number (64438929).

Almost surely, 2^128877857 is an apocalyptic number.

It is an amenable number.

128877857 is a deficient number, since it is larger than the sum of its proper divisors (1).

128877857 is an equidigital number, since it uses as much as digits as its factorization.

128877857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1756160, while the sum is 53.

The square root of 128877857 is about 11352.4383724379. The cubic root of 128877857 is about 505.1179112312.

The spelling of 128877857 in words is "one hundred twenty-eight million, eight hundred seventy-seven thousand, eight hundred fifty-seven".