128664446 has 12 divisors (see below), whose sum is σ = 199426176. Its totient is φ = 62256060.

The previous prime is 128664439. The next prime is 128664451. The reversal of 128664446 is 644466821.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 31550 + ... + 35393.

It is an arithmetic number, because the mean of its divisors is an integer number (16618848).

Almost surely, 2^128664446 is an apocalyptic number.

128664446 is a deficient number, since it is larger than the sum of its proper divisors (70761730).

128664446 is an equidigital number, since it uses as much as digits as its factorization.

128664446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67007 (or 66976 counting only the distinct ones).

The product of its digits is 221184, while the sum is 41.

The square root of 128664446 is about 11343.0351317449. The cubic root of 128664446 is about 504.8389461263.

The spelling of 128664446 in words is "one hundred twenty-eight million, six hundred sixty-four thousand, four hundred forty-six".