128404260 has 36 divisors (see below), whose sum is σ = 389493468. Its totient is φ = 34241088.

The previous prime is 128404259. The next prime is 128404271. The reversal of 128404260 is 62404821.

It can be written as a sum of positive squares in 2 ways, for example, as 25341156 + 103063104 = 5034^2 + 10152^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×128404260² = 32975307972295200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 356499 + ... + 356858.

It is an arithmetic number, because the mean of its divisors is an integer number (10819263).

Almost surely, 2^128404260 is an apocalyptic number.

128404260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128404260 is an abundant number, since it is smaller than the sum of its proper divisors (261089208).

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

128404260 is a wasteful number, since it uses less digits than its factorization.

128404260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713372 (or 713367 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 128404260 is about 11331.5603515138. The cubic root of 128404260 is about 504.4984203892.

The spelling of 128404260 in words is "one hundred twenty-eight million, four hundred four thousand, two hundred sixty".