128490816 has 56 divisors (see below), whose sum is σ = 341603584. Its totient is φ = 42624000.

The previous prime is 128490799. The next prime is 128490823. The reversal of 128490816 is 618094821.

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, 41316 + ... + 44316.

It is an arithmetic number, because the mean of its divisors is an integer number (6100064).

Almost surely, 2^128490816 is an apocalyptic number.

128490816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128490816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170801792).

128490816 is an abundant number, since it is smaller than the sum of its proper divisors (213112768).

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

128490816 is a wasteful number, since it uses less digits than its factorization.

128490816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239 (or 3229 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 128490816 is about 11335.3789526420. The cubic root of 128490816 is about 504.6117540046.

The spelling of 128490816 in words is "one hundred twenty-eight million, four hundred ninety thousand, eight hundred sixteen".