128681190 has 128 divisors (see below), whose sum is σ = 384791040. Its totient is φ = 30326400.

The previous prime is 128681173. The next prime is 128681197. The reversal of 128681190 is 91186821.

It is a super-2 number, since 2×128681190² = 33117697319632200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128681197) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 109305 + ... + 110475.

It is an arithmetic number, because the mean of its divisors is an integer number (3006180).

Almost surely, 2^128681190 is an apocalyptic number.

128681190 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 128681190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192395520).

128681190 is an abundant number, since it is smaller than the sum of its proper divisors (256109850).

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

128681190 is a wasteful number, since it uses less digits than its factorization.

128681190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235 (or 1229 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 128681190 is about 11343.7731817945. The cubic root of 128681190 is about 504.8608445785.

The spelling of 128681190 in words is "one hundred twenty-eight million, six hundred eighty-one thousand, one hundred ninety".