128666712 has 32 divisors (see below), whose sum is σ = 322225200. Its totient is φ = 42814464.

The previous prime is 128666663. The next prime is 128666719. The reversal of 128666712 is 217666821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128666719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10464 + ... + 19152.

Almost surely, 2^128666712 is an apocalyptic number.

128666712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128666712 is an abundant number, since it is smaller than the sum of its proper divisors (193558488).

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

128666712 is a wasteful number, since it uses less digits than its factorization.

128666712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9315 (or 9311 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 128666712 is about 11343.1350163877. The cubic root of 128666712 is about 504.8419098001.

The spelling of 128666712 in words is "one hundred twenty-eight million, six hundred sixty-six thousand, seven hundred twelve".