128266872 has 64 divisors (see below), whose sum is σ = 341712000. Its totient is φ = 40005504.

The previous prime is 128266861. The next prime is 128266909. The reversal of 128266872 is 278662821.

It is a happy number.

It is a zygodrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36154 + ... + 39542.

It is an arithmetic number, because the mean of its divisors is an integer number (5339250).

Almost surely, 2^128266872 is an apocalyptic number.

128266872 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 128266872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170856000).

128266872 is an abundant number, since it is smaller than the sum of its proper divisors (213445128).

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

128266872 is a wasteful number, since it uses less digits than its factorization.

128266872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500 (or 3496 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 128266872 is about 11325.4965454059. The cubic root of 128266872 is about 504.3184243773.

The spelling of 128266872 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, eight hundred seventy-two".