128039280 has 80 divisors (see below), whose sum is σ = 405402624. Its totient is φ = 33414400.

The previous prime is 128039279. The next prime is 128039281. The reversal of 128039280 is 82930821.

It is an interprime number because it is at equal distance from previous prime (128039279) and next prime (128039281).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128039281) 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, 5605 + ... + 16955.

Almost surely, 2^128039280 is an apocalyptic number.

128039280 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 128039280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202701312).

128039280 is an abundant number, since it is smaller than the sum of its proper divisors (277363344).

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

128039280 is a wasteful number, since it uses less digits than its factorization.

128039280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11414 (or 11408 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 128039280 is about 11315.4443129733. Note that the first 3 decimals coincide. The cubic root of 128039280 is about 504.0199664552.

The spelling of 128039280 in words is "one hundred twenty-eight million, thirty-nine thousand, two hundred eighty".