128891910 has 64 divisors (see below), whose sum is σ = 355590144. Its totient is φ = 29289600.

The previous prime is 128891899. The next prime is 128891911. The reversal of 128891910 is 19198821.

It is a super-2 number, since 2×128891910² = 33226248926896200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128891911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36315 + ... + 39705.

It is an arithmetic number, because the mean of its divisors is an integer number (5556096).

Almost surely, 2^128891910 is an apocalyptic number.

128891910 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 128891910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177795072).

128891910 is an abundant number, since it is smaller than the sum of its proper divisors (226698234).

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

128891910 is a wasteful number, since it uses less digits than its factorization.

128891910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 128891910 is about 11353.0572974860. The cubic root of 128891910 is about 505.1362701233.

The spelling of 128891910 in words is "one hundred twenty-eight million, eight hundred ninety-one thousand, nine hundred ten".