128276772 has 48 divisors (see below), whose sum is σ = 324848832. Its totient is φ = 39162240.

The previous prime is 128276737. The next prime is 128276779. The reversal of 128276772 is 277672821.

It is not an unprimeable number, because it can be changed into a prime (128276779) by changing a digit.

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, 17298 + ... + 23574.

It is an arithmetic number, because the mean of its divisors is an integer number (6767684).

Almost surely, 2^128276772 is an apocalyptic number.

128276772 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 128276772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162424416).

128276772 is an abundant number, since it is smaller than the sum of its proper divisors (196572060).

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

128276772 is a wasteful number, since it uses less digits than its factorization.

128276772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6428 (or 6426 counting only the distinct ones).

The product of its digits is 131712, while the sum is 42.

The square root of 128276772 is about 11325.9336039022. The cubic root of 128276772 is about 504.3313989510.

The spelling of 128276772 in words is "one hundred twenty-eight million, two hundred seventy-six thousand, seven hundred seventy-two".