128549172 has 48 divisors (see below), whose sum is σ = 318511872. Its totient is φ = 40212480.

The previous prime is 128549167. The next prime is 128549173. The reversal of 128549172 is 271945821.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 128549172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128549173) 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, 93772 + ... + 95132.

It is an arithmetic number, because the mean of its divisors is an integer number (6635664).

Almost surely, 2^128549172 is an apocalyptic number.

128549172 is a gapful number since it is divisible by the number (12) 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 128549172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159255936).

128549172 is an abundant number, since it is smaller than the sum of its proper divisors (189962700).

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

128549172 is a wasteful number, since it uses less digits than its factorization.

128549172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848 (or 1846 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 128549172 is about 11337.9527252498. The cubic root of 128549172 is about 504.6881347339.

The spelling of 128549172 in words is "one hundred twenty-eight million, five hundred forty-nine thousand, one hundred seventy-two".