128759998 has 16 divisors (see below), whose sum is σ = 204797520. Its totient is φ = 60543936.

The previous prime is 128759987. The next prime is 128759999. The reversal of 128759998 is 899957821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128759999) 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 in 7 ways as a sum of consecutive naturals, for example, 7161 + ... + 17572.

It is an arithmetic number, because the mean of its divisors is an integer number (12799845).

Almost surely, 2^128759998 is an apocalyptic number.

128759998 is a deficient number, since it is larger than the sum of its proper divisors (76037522).

128759998 is a wasteful number, since it uses less digits than its factorization.

128759998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24891.

The product of its digits is 3265920, while the sum is 58.

The square root of 128759998 is about 11347.2462738763. The cubic root of 128759998 is about 504.9638872323.

The spelling of 128759998 in words is "one hundred twenty-eight million, seven hundred fifty-nine thousand, nine hundred ninety-eight".