128051890 has 16 divisors (see below), whose sum is σ = 233412480. Its totient is φ = 50572080.

The previous prime is 128051881. The next prime is 128051899. The reversal of 128051890 is 98150821.

It is an interprime number because it is at equal distance from previous prime (128051881) and next prime (128051899).

It is not an unprimeable number, because it can be changed into a prime (128051899) 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, 80256 + ... + 81835.

It is an arithmetic number, because the mean of its divisors is an integer number (14588280).

Almost surely, 2^128051890 is an apocalyptic number.

128051890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128051890 is a deficient number, since it is larger than the sum of its proper divisors (105360590).

128051890 is a wasteful number, since it uses less digits than its factorization.

128051890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162177.

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

The square root of 128051890 is about 11316.0015022975. The cubic root of 128051890 is about 504.0365121151.

Subtracting from 128051890 its sum of digits (34), we obtain a square (128051856 = 11316²).

The spelling of 128051890 in words is "one hundred twenty-eight million, fifty-one thousand, eight hundred ninety".