128408878400 has 126 divisors (see below), whose sum is σ = 347302100670. Its totient is φ = 46694067200.

The previous prime is 128408878393. The next prime is 128408878421. The reversal of 128408878400 is 4878804821.

It can be written as a sum of positive squares in 3 ways, for example, as 193321216 + 128215557184 = 13904^2 + 358072^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 138035 + ... + 525234.

Almost surely, 2^128408878400 is an apocalyptic number.

128408878400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128408878400 is an abundant number, since it is smaller than the sum of its proper divisors (218893222270).

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

128408878400 is a wasteful number, since it uses less digits than its factorization.

128408878400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663313 (or 663287 counting only the distinct ones).

The product of its (nonzero) digits is 917504, while the sum is 50.

The spelling of 128408878400 in words is "one hundred twenty-eight billion, four hundred eight million, eight hundred seventy-eight thousand, four hundred".