128787577 has 2 divisors, whose sum is σ = 128787578. Its totient is φ = 128787576.

The previous prime is 128787559. The next prime is 128787587. The reversal of 128787577 is 775787821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112699456 + 16088121 = 10616^2 + 4011^2 .

It is a cyclic number.

It is not a de Polignac number, because 128787577 - 2¹¹ = 128785529 is a prime.

It is not a weakly prime, because it can be changed into another prime (128787517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64393788 + 64393789.

It is an arithmetic number, because the mean of its divisors is an integer number (64393789).

Almost surely, 2^128787577 is an apocalyptic number.

It is an amenable number.

128787577 is a deficient number, since it is larger than the sum of its proper divisors (1).

128787577 is an equidigital number, since it uses as much as digits as its factorization.

128787577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536640, while the sum is 52.

The square root of 128787577 is about 11348.4614375694. The cubic root of 128787577 is about 504.9999372610. Note that the first 4 decimals are identical.

The spelling of 128787577 in words is "one hundred twenty-eight million, seven hundred eighty-seven thousand, five hundred seventy-seven".