128478900 has 72 divisors (see below), whose sum is σ = 405536544. Its totient is φ = 31145600.

The previous prime is 128478899. The next prime is 128478901. The reversal of 128478900 is 9874821.

It is an interprime number because it is at equal distance from previous prime (128478899) and next prime (128478901).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128478901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16167 + ... + 22766.

It is an arithmetic number, because the mean of its divisors is an integer number (5632452).

Almost surely, 2^128478900 is an apocalyptic number.

128478900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128478900 is an abundant number, since it is smaller than the sum of its proper divisors (277057644).

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

128478900 is a wasteful number, since it uses less digits than its factorization.

128478900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38961 (or 38954 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 128478900 is about 11334.8533294437. The cubic root of 128478900 is about 504.5961546029.

The spelling of 128478900 in words is "one hundred twenty-eight million, four hundred seventy-eight thousand, nine hundred".