128203680 has 96 divisors (see below), whose sum is σ = 440572608. Its totient is φ = 31078400.

The previous prime is 128203657. The next prime is 128203687. The reversal of 128203680 is 86302821.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128203687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6861 + ... + 17420.

It is an arithmetic number, because the mean of its divisors is an integer number (4589298).

Almost surely, 2^128203680 is an apocalyptic number.

128203680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128203680 is an abundant number, since it is smaller than the sum of its proper divisors (312368928).

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

128203680 is a wasteful number, since it uses less digits than its factorization.

128203680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24310 (or 24302 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 128203680 is about 11322.7063902585. The cubic root of 128203680 is about 504.2355915452.

The spelling of 128203680 in words is "one hundred twenty-eight million, two hundred three thousand, six hundred eighty".