128632667 has 2 divisors, whose sum is σ = 128632668. Its totient is φ = 128632666.

The previous prime is 128632657. The next prime is 128632709. The reversal of 128632667 is 766236821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128632667 - 2⁸ = 128632411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128632607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64316333 + 64316334.

It is an arithmetic number, because the mean of its divisors is an integer number (64316334).

Almost surely, 2^128632667 is an apocalyptic number.

128632667 is a deficient number, since it is larger than the sum of its proper divisors (1).

128632667 is an equidigital number, since it uses as much as digits as its factorization.

128632667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 128632667 is about 11341.6342296867. The cubic root of 128632667 is about 504.7973790931.

The spelling of 128632667 in words is "one hundred twenty-eight million, six hundred thirty-two thousand, six hundred sixty-seven".