128291890 has 16 divisors (see below), whose sum is σ = 231181632. Its totient is φ = 51259824.

The previous prime is 128291851. The next prime is 128291899. The reversal of 128291890 is 98192821.

It is not an unprimeable number, because it can be changed into a prime (128291899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3037 + ... + 16303.

It is an arithmetic number, because the mean of its divisors is an integer number (14448852).

Almost surely, 2^128291890 is an apocalyptic number.

128291890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128291890 is a deficient number, since it is larger than the sum of its proper divisors (102889742).

128291890 is a wasteful number, since it uses less digits than its factorization.

128291890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14241.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 128291890 is about 11326.6009905885. The cubic root of 128291890 is about 504.3512107544.

The spelling of 128291890 in words is "one hundred twenty-eight million, two hundred ninety-one thousand, eight hundred ninety".