128305380 has 48 divisors (see below), whose sum is σ = 410578560. Its totient is φ = 29326848.

The previous prime is 128305369. The next prime is 128305391. The reversal of 128305380 is 83503821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128305369) and next prime (128305391).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152325 + ... + 153164.

It is an arithmetic number, because the mean of its divisors is an integer number (8553720).

Almost surely, 2^128305380 is an apocalyptic number.

128305380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128305380 is an abundant number, since it is smaller than the sum of its proper divisors (282273180).

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

128305380 is a wasteful number, since it uses less digits than its factorization.

128305380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305508 (or 305506 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 128305380 is about 11327.1964757393. The cubic root of 128305380 is about 504.3688877860.

The spelling of 128305380 in words is "one hundred twenty-eight million, three hundred five thousand, three hundred eighty".