128730840 has 96 divisors (see below), whose sum is σ = 449264880. Its totient is φ = 29422848.

The previous prime is 128730829. The next prime is 128730907. The reversal of 128730840 is 48037821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5067 + ... + 16826.

Almost surely, 2^128730840 is an apocalyptic number.

128730840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128730840 is an abundant number, since it is smaller than the sum of its proper divisors (320534040).

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

128730840 is a wasteful number, since it uses less digits than its factorization.

128730840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21921 (or 21910 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 128730840 is about 11345.9613960211. The cubic root of 128730840 is about 504.9257676072.

The spelling of 128730840 in words is "one hundred twenty-eight million, seven hundred thirty thousand, eight hundred forty".