128173640 has 64 divisors (see below), whose sum is σ = 332588160. Its totient is φ = 43545600.

The previous prime is 128173621. The next prime is 128173651. The reversal of 128173640 is 46371821.

It is a junction number, because it is equal to n+sod(n) for n = 128173597 and 128173606.

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 15 ways as a sum of consecutive naturals, for example, 29615 + ... + 33665.

It is an arithmetic number, because the mean of its divisors is an integer number (5196690).

Almost surely, 2^128173640 is an apocalyptic number.

128173640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128173640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166294080).

128173640 is an abundant number, since it is smaller than the sum of its proper divisors (204414520).

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

128173640 is a wasteful number, since it uses less digits than its factorization.

128173640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4182 (or 4178 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 128173640 is about 11321.3797745681. The cubic root of 128173640 is about 504.1962052072.

The spelling of 128173640 in words is "one hundred twenty-eight million, one hundred seventy-three thousand, six hundred forty".