128839680 has 208 divisors, whose sum is σ = 460006560. Its totient is φ = 34209792.

The previous prime is 128839673. The next prime is 128839681. The reversal of 128839680 is 86938821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128839681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552844 + ... + 553076.

It is an arithmetic number, because the mean of its divisors is an integer number (2211570).

Almost surely, 2^128839680 is an apocalyptic number.

128839680 is a gapful number since it is divisible by the number (10) 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 128839680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230003280).

128839680 is an abundant number, since it is smaller than the sum of its proper divisors (331166880).

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

128839680 is an equidigital number, since it uses as much as digits as its factorization.

128839680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 128839680 is about 11350.7568029625. The cubic root of 128839680 is about 505.0680299162.

The spelling of 128839680 in words is "one hundred twenty-eight million, eight hundred thirty-nine thousand, six hundred eighty".