128668446 has 16 divisors (see below), whose sum is σ = 285930000. Its totient is φ = 42889464.

The previous prime is 128668409. The next prime is 128668453. The reversal of 128668446 is 644866821.

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, 1191321 + ... + 1191428.

It is an arithmetic number, because the mean of its divisors is an integer number (17870625).

Almost surely, 2^128668446 is an apocalyptic number.

128668446 is an abundant number, since it is smaller than the sum of its proper divisors (157261554).

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

128668446 is a wasteful number, since it uses less digits than its factorization.

128668446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382760 (or 2382754 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 128668446 is about 11343.2114500260. The cubic root of 128668446 is about 504.8441776540.

It can be divided in two parts, 12866 and 8446, that added together give a palindrome (21312).

The spelling of 128668446 in words is "one hundred twenty-eight million, six hundred sixty-eight thousand, four hundred forty-six".