128666616 has 128 divisors (see below), whose sum is σ = 365783040. Its totient is φ = 37440000.

The previous prime is 128666611. The next prime is 128666639. The reversal of 128666616 is 616666821.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128666611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 512491 + ... + 512741.

It is an arithmetic number, because the mean of its divisors is an integer number (2857680).

Almost surely, 2^128666616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128666616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182891520).

128666616 is an abundant number, since it is smaller than the sum of its proper divisors (237116424).

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

128666616 is a wasteful number, since it uses less digits than its factorization.

128666616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 353 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 128666616 is about 11343.1307847525. The cubic root of 128666616 is about 504.8417842436.

The spelling of 128666616 in words is "one hundred twenty-eight million, six hundred sixty-six thousand, six hundred sixteen".