128508921190 has 32 divisors (see below), whose sum is σ = 257699594880. Its totient is φ = 45813258624.

The previous prime is 128508921119. The next prime is 128508921197. The reversal of 128508921190 is 91129805821.

It is a happy number.

It is a super-2 number, since 2×128508921190² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128508921190.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128508921197) 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, 17039854 + ... + 17047393.

It is an arithmetic number, because the mean of its divisors is an integer number (8053112340).

Almost surely, 2^128508921190 is an apocalyptic number.

128508921190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128508921190 is an abundant number, since it is smaller than the sum of its proper divisors (129190673690).

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

128508921190 is a wasteful number, since it uses less digits than its factorization.

128508921190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34087296.

The product of its (nonzero) digits is 103680, while the sum is 46.

The spelling of 128508921190 in words is "one hundred twenty-eight billion, five hundred eight million, nine hundred twenty-one thousand, one hundred ninety".