128168090 has 16 divisors (see below), whose sum is σ = 230848488. Its totient is φ = 51234816.

The previous prime is 128168087. The next prime is 128168093. The reversal of 128168090 is 90861821.

It is an interprime number because it is at equal distance from previous prime (128168087) and next prime (128168093).

It can be written as a sum of positive squares in 4 ways, for example, as 30019441 + 98148649 = 5479^2 + 9907^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128168090.

It is not an unprimeable number, because it can be changed into a prime (128168093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18554 + ... + 24506.

Almost surely, 2^128168090 is an apocalyptic number.

128168090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128168090 is a deficient number, since it is larger than the sum of its proper divisors (102680398).

128168090 is a wasteful number, since it uses less digits than its factorization.

128168090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8113.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 128168090 is about 11321.1346604481. The cubic root of 128168090 is about 504.1889277636.

Subtracting from 128168090 its sum of digits (35), we obtain a triangular number (128168055 = T₁₆₀₁₀).

The spelling of 128168090 in words is "one hundred twenty-eight million, one hundred sixty-eight thousand, ninety".