128678699 has 2 divisors, whose sum is σ = 128678700. Its totient is φ = 128678698.

The previous prime is 128678689. The next prime is 128678701. The reversal of 128678699 is 996876821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128678699 - 2⁸ = 128678443 is a prime.

Together with 128678701, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128678609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64339349 + 64339350.

It is an arithmetic number, because the mean of its divisors is an integer number (64339350).

Almost surely, 2^128678699 is an apocalyptic number.

128678699 is a deficient number, since it is larger than the sum of its proper divisors (1).

128678699 is an equidigital number, since it uses as much as digits as its factorization.

128678699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 56.

The square root of 128678699 is about 11343.6633853443. The cubic root of 128678699 is about 504.8575868724.

The spelling of 128678699 in words is "one hundred twenty-eight million, six hundred seventy-eight thousand, six hundred ninety-nine".