128185090 has 32 divisors (see below), whose sum is σ = 254041920. Its totient is φ = 46180800.

The previous prime is 128185069. The next prime is 128185097. The reversal of 128185090 is 90581821.

It is not an unprimeable number, because it can be changed into a prime (128185097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6645 + ... + 17335.

It is an arithmetic number, because the mean of its divisors is an integer number (7938810).

Almost surely, 2^128185090 is an apocalyptic number.

128185090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128185090 is a deficient number, since it is larger than the sum of its proper divisors (125856830).

128185090 is a wasteful number, since it uses less digits than its factorization.

128185090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10818.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 128185090 is about 11321.8854436883. The cubic root of 128185090 is about 504.2112183687.

The spelling of 128185090 in words is "one hundred twenty-eight million, one hundred eighty-five thousand, ninety".