128863120 has 20 divisors (see below), whose sum is σ = 299606940. Its totient is φ = 51545216.

The previous prime is 128863093. The next prime is 128863121. The reversal of 128863120 is 21368821.

It can be written as a sum of positive squares in 2 ways, for example, as 66389904 + 62473216 = 8148^2 + 7904^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×128863120² = 33211407392268800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128863121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805315 + ... + 805474.

It is an arithmetic number, because the mean of its divisors is an integer number (14980347).

Almost surely, 2^128863120 is an apocalyptic number.

128863120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128863120 is an abundant number, since it is smaller than the sum of its proper divisors (170743820).

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

128863120 is a wasteful number, since it uses less digits than its factorization.

128863120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610802 (or 1610796 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 128863120 is about 11351.7892862755. The cubic root of 128863120 is about 505.0986573253.

The spelling of 128863120 in words is "one hundred twenty-eight million, eight hundred sixty-three thousand, one hundred twenty".