128976787 has 2 divisors, whose sum is σ = 128976788. Its totient is φ = 128976786.

The previous prime is 128976781. The next prime is 128976797. The reversal of 128976787 is 787679821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128976787 - 2¹¹ = 128974739 is a prime.

It is not a weakly prime, because it can be changed into another prime (128976781) 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, 64488393 + 64488394.

It is an arithmetic number, because the mean of its divisors is an integer number (64488394).

Almost surely, 2^128976787 is an apocalyptic number.

128976787 is a deficient number, since it is larger than the sum of its proper divisors (1).

128976787 is an equidigital number, since it uses as much as digits as its factorization.

128976787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 55.

The square root of 128976787 is about 11356.7947502806. The cubic root of 128976787 is about 505.2471253961.

The spelling of 128976787 in words is "one hundred twenty-eight million, nine hundred seventy-six thousand, seven hundred eighty-seven".