128890530 has 48 divisors (see below), whose sum is σ = 337559040. Its totient is φ = 34120224.

The previous prime is 128890519. The next prime is 128890579. The reversal of 128890530 is 35098821.

It is a super-2 number, since 2×128890530² = 33225537447361800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7359 + ... + 17661.

It is an arithmetic number, because the mean of its divisors is an integer number (7032480).

Almost surely, 2^128890530 is an apocalyptic number.

128890530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128890530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168779520).

128890530 is an abundant number, since it is smaller than the sum of its proper divisors (208668510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128890530 is a wasteful number, since it uses less digits than its factorization.

128890530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10455 (or 10452 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 128890530 is about 11352.9965207429. The cubic root of 128890530 is about 505.1344673452.

The spelling of 128890530 in words is "one hundred twenty-eight million, eight hundred ninety thousand, five hundred thirty".