128668770 has 64 divisors (see below), whose sum is σ = 344816640. Its totient is φ = 34141824.

The previous prime is 128668763. The next prime is 128668781. The reversal of 128668770 is 77866821.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59142 + ... + 61278.

It is an arithmetic number, because the mean of its divisors is an integer number (5387760).

Almost surely, 2^128668770 is an apocalyptic number.

128668770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128668770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172408320).

128668770 is an abundant number, since it is smaller than the sum of its proper divisors (216147870).

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

128668770 is a wasteful number, since it uses less digits than its factorization.

128668770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376 (or 2370 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 128668770 is about 11343.2257316867. The cubic root of 128668770 is about 504.8446014030.

The spelling of 128668770 in words is "one hundred twenty-eight million, six hundred sixty-eight thousand, seven hundred seventy".