128436877 has 2 divisors, whose sum is σ = 128436878. Its totient is φ = 128436876.

The previous prime is 128436871. The next prime is 128436881. The reversal of 128436877 is 778634821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64979721 + 63457156 = 8061^2 + 7966^2 .

It is an emirp because it is prime and its reverse (778634821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128436877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128436871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64218438 + 64218439.

It is an arithmetic number, because the mean of its divisors is an integer number (64218439).

Almost surely, 2^128436877 is an apocalyptic number.

It is an amenable number.

128436877 is a deficient number, since it is larger than the sum of its proper divisors (1).

128436877 is an equidigital number, since it uses as much as digits as its factorization.

128436877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 46.

The square root of 128436877 is about 11332.9994705727. Note that the first 3 decimals coincide. The cubic root of 128436877 is about 504.5411340081.

The spelling of 128436877 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, eight hundred seventy-seven".