128255420 has 24 divisors (see below), whose sum is σ = 273359184. Its totient is φ = 50535936.

The previous prime is 128255417. The next prime is 128255423. The reversal of 128255420 is 24552821.

It is an interprime number because it is at equal distance from previous prime (128255417) and next prime (128255423).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128255423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46517 + ... + 49196.

It is an arithmetic number, because the mean of its divisors is an integer number (11389966).

Almost surely, 2^128255420 is an apocalyptic number.

128255420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128255420 is an abundant number, since it is smaller than the sum of its proper divisors (145103764).

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

128255420 is a wasteful number, since it uses less digits than its factorization.

128255420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95789 (or 95787 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 128255420 is about 11324.9909492238. The cubic root of 128255420 is about 504.3034149770.

The spelling of 128255420 in words is "one hundred twenty-eight million, two hundred fifty-five thousand, four hundred twenty".