128149872 has 20 divisors (see below), whose sum is σ = 331053960. Its totient is φ = 42716608.

The previous prime is 128149867. The next prime is 128149873. The reversal of 128149872 is 278941821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128149873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1334847 + ... + 1334942.

It is an arithmetic number, because the mean of its divisors is an integer number (16552698).

Almost surely, 2^128149872 is an apocalyptic number.

128149872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128149872 is an abundant number, since it is smaller than the sum of its proper divisors (202904088).

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

128149872 is a wasteful number, since it uses less digits than its factorization.

128149872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669800 (or 2669794 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 128149872 is about 11320.3300305247. The cubic root of 128149872 is about 504.1650379141.

The spelling of 128149872 in words is "one hundred twenty-eight million, one hundred forty-nine thousand, eight hundred seventy-two".