128505122190 has 80 divisors (see below), whose sum is σ = 357451094880. Its totient is φ = 33086370240.

The previous prime is 128505122189. The next prime is 128505122197. The reversal of 128505122190 is 91221505821.

128505122190 is a `hidden beast` number, since 1 + 2 + 8 + 50 + 512 + 2 + 1 + 90 = 666.

It is a super-2 number, since 2×128505122190² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128505122197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2711826 + ... + 2758805.

It is an arithmetic number, because the mean of its divisors is an integer number (4468138686).

Almost surely, 2^128505122190 is an apocalyptic number.

128505122190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128505122190 is an abundant number, since it is smaller than the sum of its proper divisors (228945972690).

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

128505122190 is a wasteful number, since it uses less digits than its factorization.

128505122190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5470679 (or 5470670 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The spelling of 128505122190 in words is "one hundred twenty-eight billion, five hundred five million, one hundred twenty-two thousand, one hundred ninety".