128984772 has 48 divisors (see below), whose sum is σ = 346465280. Its totient is φ = 36584352.

The previous prime is 128984767. The next prime is 128984789. The reversal of 128984772 is 277489821.

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, 6153 + ... + 17199.

Almost surely, 2^128984772 is an apocalyptic number.

128984772 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 128984772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173232640).

128984772 is an abundant number, since it is smaller than the sum of its proper divisors (217480508).

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

128984772 is a wasteful number, since it uses less digits than its factorization.

128984772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11200 (or 11198 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 128984772 is about 11357.1462964954. The cubic root of 128984772 is about 505.2575518589.

The spelling of 128984772 in words is "one hundred twenty-eight million, nine hundred eighty-four thousand, seven hundred seventy-two".