128860830 has 96 divisors (see below), whose sum is σ = 385953984. Its totient is φ = 29219328.

The previous prime is 128860813. The next prime is 128860859. The reversal of 128860830 is 38068821.

128860830 is a `hidden beast` number, since 12 + 8 + 8 + 608 + 30 = 666.

It is a super-2 number, since 2×128860830² = 33210227016577800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 85564 + ... + 87056.

It is an arithmetic number, because the mean of its divisors is an integer number (4020354).

Almost surely, 2^128860830 is an apocalyptic number.

128860830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128860830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192976992).

128860830 is an abundant number, since it is smaller than the sum of its proper divisors (257093154).

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

128860830 is a wasteful number, since it uses less digits than its factorization.

128860830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650 (or 1647 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 128860830 is about 11351.6884206712. The cubic root of 128860830 is about 505.0956653061.

The spelling of 128860830 in words is "one hundred twenty-eight million, eight hundred sixty thousand, eight hundred thirty".