128269878 has 64 divisors (see below), whose sum is σ = 293289984. Its totient is φ = 37044000.

The previous prime is 128269877. The next prime is 128269891. The reversal of 128269878 is 878962821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 128269878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128269877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144825 + ... + 145707.

It is an arithmetic number, because the mean of its divisors is an integer number (4582656).

Almost surely, 2^128269878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128269878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146644992).

128269878 is an abundant number, since it is smaller than the sum of its proper divisors (165020106).

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

128269878 is a wasteful number, since it uses less digits than its factorization.

128269878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001.

The product of its digits is 774144, while the sum is 51.

The square root of 128269878 is about 11325.6292540415. The cubic root of 128269878 is about 504.3223640002.

The spelling of 128269878 in words is "one hundred twenty-eight million, two hundred sixty-nine thousand, eight hundred seventy-eight".