128481856 has 42 divisors (see below), whose sum is σ = 263571990. Its totient is φ = 62138880.

The previous prime is 128481853. The next prime is 128481863. The reversal of 128481856 is 658184821.

It can be written as a sum of positive squares in only one way, i.e., 124545600 + 3936256 = 11160^2 + 1984^2 .

It is not an unprimeable number, because it can be changed into a prime (128481853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60460 + ... + 62548.

Almost surely, 2^128481856 is an apocalyptic number.

128481856 is a gapful number since it is divisible by the number (16) 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 128481856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131785995).

128481856 is an abundant number, since it is smaller than the sum of its proper divisors (135090134).

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

128481856 is an equidigital number, since it uses as much as digits as its factorization.

128481856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163 (or 2122 counting only the distinct ones).

The product of its digits is 122880, while the sum is 43.

The square root of 128481856 is about 11334.9837229702. The cubic root of 128481856 is about 504.6000244337.

The spelling of 128481856 in words is "one hundred twenty-eight million, four hundred eighty-one thousand, eight hundred fifty-six".