128990155 has 16 divisors (see below), whose sum is σ = 177617664. Its totient is φ = 88092000.

The previous prime is 128990149. The next prime is 128990159. The reversal of 128990155 is 551099821.

It is not a de Polignac number, because 128990155 - 2⁵ = 128990123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128990159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1444 + ... + 16126.

It is an arithmetic number, because the mean of its divisors is an integer number (11101104).

Almost surely, 2^128990155 is an apocalyptic number.

128990155 is a deficient number, since it is larger than the sum of its proper divisors (48627509).

128990155 is a wasteful number, since it uses less digits than its factorization.

128990155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14946.

The product of its (nonzero) digits is 32400, while the sum is 40.

The square root of 128990155 is about 11357.3832813725. The cubic root of 128990155 is about 505.2645805015.

The spelling of 128990155 in words is "one hundred twenty-eight million, nine hundred ninety thousand, one hundred fifty-five".