128666368 has 54 divisors (see below), whose sum is σ = 265889652. Its totient is φ = 62138880.

The previous prime is 128666357. The next prime is 128666371. The reversal of 128666368 is 863666821.

It is a super-2 number, since 2×128666368² = 33110068508622848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 245755 + ... + 246277.

Almost surely, 2^128666368 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 128666368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132944826).

128666368 is an abundant number, since it is smaller than the sum of its proper divisors (137223284).

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

128666368 is an frugal number, since it uses more digits than its factorization.

128666368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 556 counting only the distinct ones).

The product of its digits is 497664, while the sum is 46.

The square root of 128666368 is about 11343.1198530210. The cubic root of 128666368 is about 504.8414598889.

The spelling of 128666368 in words is "one hundred twenty-eight million, six hundred sixty-six thousand, three hundred sixty-eight".