128600816 has 40 divisors (see below), whose sum is σ = 264752400. Its totient is φ = 60341760.

The previous prime is 128600807. The next prime is 128600821. The reversal of 128600816 is 618006821.

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, 31196 + ... + 35076.

It is an arithmetic number, because the mean of its divisors is an integer number (6618810).

Almost surely, 2^128600816 is an apocalyptic number.

128600816 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 128600816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132376200).

128600816 is an abundant number, since it is smaller than the sum of its proper divisors (136151584).

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

128600816 is a wasteful number, since it uses less digits than its factorization.

128600816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017 (or 4011 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 128600816 is about 11340.2299800313. The cubic root of 128600816 is about 504.7557110136.

The spelling of 128600816 in words is "one hundred twenty-eight million, six hundred thousand, eight hundred sixteen".