128185850 has 48 divisors (see below), whose sum is σ = 258316800. Its totient is φ = 47044800.

The previous prime is 128185847. The next prime is 128185879. The reversal of 128185850 is 58581821.

It is a super-2 number, since 2×128185850² = 32863224280445000, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128855 + ... + 129845.

It is an arithmetic number, because the mean of its divisors is an integer number (5381600).

Almost surely, 2^128185850 is an apocalyptic number.

128185850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128185850 is an abundant number, since it is smaller than the sum of its proper divisors (130130950).

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

128185850 is a wasteful number, since it uses less digits than its factorization.

128185850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215 (or 1210 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 38.

The square root of 128185850 is about 11321.9190069528. The cubic root of 128185850 is about 504.2122148438.

The spelling of 128185850 in words is "one hundred twenty-eight million, one hundred eighty-five thousand, eight hundred fifty".