128692667 has 2 divisors, whose sum is σ = 128692668. Its totient is φ = 128692666.

The previous prime is 128692637. The next prime is 128692693. The reversal of 128692667 is 766296821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128692667 is a prime.

It is not a weakly prime, because it can be changed into another prime (128692637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64346333 + 64346334.

It is an arithmetic number, because the mean of its divisors is an integer number (64346334).

Almost surely, 2^128692667 is an apocalyptic number.

128692667 is a deficient number, since it is larger than the sum of its proper divisors (1).

128692667 is an equidigital number, since it uses as much as digits as its factorization.

128692667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 128692667 is about 11344.2790427598. The cubic root of 128692667 is about 504.8758535467.

The spelling of 128692667 in words is "one hundred twenty-eight million, six hundred ninety-two thousand, six hundred sixty-seven".