128125518 has 16 divisors (see below), whose sum is σ = 259495680. Its totient is φ = 42167736.

The previous prime is 128125483. The next prime is 128125537. The reversal of 128125518 is 815521821.

It is a super-2 number, since 2×128125518² = 32832296725536648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134680 + ... + 135627.

It is an arithmetic number, because the mean of its divisors is an integer number (16218480).

Almost surely, 2^128125518 is an apocalyptic number.

128125518 is an abundant number, since it is smaller than the sum of its proper divisors (131370162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128125518 is a wasteful number, since it uses less digits than its factorization.

128125518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270391.

The product of its digits is 6400, while the sum is 33.

The square root of 128125518 is about 11319.2543040608. The cubic root of 128125518 is about 504.1330981938.

The spelling of 128125518 in words is "one hundred twenty-eight million, one hundred twenty-five thousand, five hundred eighteen".