128869776 has 120 divisors (see below), whose sum is σ = 415122240. Its totient is φ = 36557568.

The previous prime is 128869751. The next prime is 128869781. The reversal of 128869776 is 677968821.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174015 + ... + 174753.

It is an arithmetic number, because the mean of its divisors is an integer number (3459352).

Almost surely, 2^128869776 is an apocalyptic number.

128869776 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 128869776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207561120).

128869776 is an abundant number, since it is smaller than the sum of its proper divisors (286252464).

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

128869776 is a wasteful number, since it uses less digits than its factorization.

128869776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933 (or 924 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 128869776 is about 11352.0824521319. The cubic root of 128869776 is about 505.1073535780.

The spelling of 128869776 in words is "one hundred twenty-eight million, eight hundred sixty-nine thousand, seven hundred seventy-six".