128889590 has 16 divisors (see below), whose sum is σ = 233774640. Its totient is φ = 51161760.

The previous prime is 128889589. The next prime is 128889617. The reversal of 128889590 is 95988821.

It is a super-2 number, since 2×128889590² = 33225052820736200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47885 + ... + 50504.

It is an arithmetic number, because the mean of its divisors is an integer number (14610915).

Almost surely, 2^128889590 is an apocalyptic number.

128889590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128889590 is a deficient number, since it is larger than the sum of its proper divisors (104885050).

128889590 is a wasteful number, since it uses less digits than its factorization.

128889590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98527.

The product of its (nonzero) digits is 414720, while the sum is 50.

The square root of 128889590 is about 11352.9551219055. The cubic root of 128889590 is about 505.1332393586.

Subtracting from 128889590 its sum of digits (50), we obtain a triangular number (128889540 = T₁₆₀₅₅).

The spelling of 128889590 in words is "one hundred twenty-eight million, eight hundred eighty-nine thousand, five hundred ninety".