128799655 has 32 divisors (see below), whose sum is σ = 168376320. Its totient is φ = 94321920.

The previous prime is 128799653. The next prime is 128799659. The reversal of 128799655 is 556997821.

It is not a de Polignac number, because 128799655 - 2¹ = 128799653 is a prime.

It is a super-2 number, since 2×128799655² = 33178702256238050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128799653) 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 31 ways as a sum of consecutive naturals, for example, 277954 + ... + 278416.

It is an arithmetic number, because the mean of its divisors is an integer number (5261760).

Almost surely, 2^128799655 is an apocalyptic number.

128799655 is a deficient number, since it is larger than the sum of its proper divisors (39576665).

128799655 is a wasteful number, since it uses less digits than its factorization.

128799655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591.

The product of its digits is 1360800, while the sum is 52.

The square root of 128799655 is about 11348.9935677134. The cubic root of 128799655 is about 505.0157234591.

The spelling of 128799655 in words is "one hundred twenty-eight million, seven hundred ninety-nine thousand, six hundred fifty-five".