128089172 has 12 divisors (see below), whose sum is σ = 231885780. Its totient is φ = 61836096.

The previous prime is 128089163. The next prime is 128089189. The reversal of 128089172 is 271980821.

It can be written as a sum of positive squares in 2 ways, for example, as 45751696 + 82337476 = 6764^2 + 9074^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551993 + ... + 552224.

It is an arithmetic number, because the mean of its divisors is an integer number (19323815).

Almost surely, 2^128089172 is an apocalyptic number.

It is an amenable number.

128089172 is a deficient number, since it is larger than the sum of its proper divisors (103796608).

128089172 is a wasteful number, since it uses less digits than its factorization.

128089172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104250 (or 1104248 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 128089172 is about 11317.6486957318. The cubic root of 128089172 is about 504.0854237082.

The spelling of 128089172 in words is "one hundred twenty-eight million, eighty-nine thousand, one hundred seventy-two".