128970666 has 48 divisors (see below), whose sum is σ = 312294528. Its totient is φ = 38126400.

The previous prime is 128970643. The next prime is 128970671. The reversal of 128970666 is 666079821.

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, 175 + ... + 16061.

It is an arithmetic number, because the mean of its divisors is an integer number (6506136).

Almost surely, 2^128970666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128970666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156147264).

128970666 is an abundant number, since it is smaller than the sum of its proper divisors (183323862).

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

128970666 is a wasteful number, since it uses less digits than its factorization.

128970666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15947 (or 15944 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 128970666 is about 11356.5252608357. The cubic root of 128970666 is about 505.2391325713.

The spelling of 128970666 in words is "one hundred twenty-eight million, nine hundred seventy thousand, six hundred sixty-six".