128877056 has 120 divisors (see below), whose sum is σ = 327474576. Its totient is φ = 50104320.

The previous prime is 128877053. The next prime is 128877107. The reversal of 128877056 is 650778821.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 128876998 and 128877016.

It is not an unprimeable number, because it can be changed into a prime (128877053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 275735 + ... + 276201.

Almost surely, 2^128877056 is an apocalyptic number.

128877056 is a gapful number since it is divisible by the number (16) 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 128877056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163737288).

128877056 is an abundant number, since it is smaller than the sum of its proper divisors (198597520).

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

128877056 is an equidigital number, since it uses as much as digits as its factorization.

128877056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 44.

The square root of 128877056 is about 11352.4030936185. The cubic root of 128877056 is about 505.1168647616.

The spelling of 128877056 in words is "one hundred twenty-eight million, eight hundred seventy-seven thousand, fifty-six".