128669280 has 96 divisors (see below), whose sum is σ = 407822688. Its totient is φ = 34099200.

The previous prime is 128669263. The next prime is 128669297. The reversal of 128669280 is 82966821.

It is an interprime number because it is at equal distance from previous prime (128669263) and next prime (128669297).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86140 + ... + 87620.

It is an arithmetic number, because the mean of its divisors is an integer number (4248153).

Almost surely, 2^128669280 is an apocalyptic number.

128669280 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 128669280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203911344).

128669280 is an abundant number, since it is smaller than the sum of its proper divisors (279153408).

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

128669280 is a wasteful number, since it uses less digits than its factorization.

128669280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680 (or 1672 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 128669280 is about 11343.2482120423. The cubic root of 128669280 is about 504.8452684139.

The spelling of 128669280 in words is "one hundred twenty-eight million, six hundred sixty-nine thousand, two hundred eighty".