128811664 has 10 divisors (see below), whose sum is σ = 249572630. Its totient is φ = 64405824.

The previous prime is 128811653. The next prime is 128811667. The reversal of 128811664 is 466118821.

It can be written as a sum of positive squares in only one way, i.e., 79923600 + 48888064 = 8940^2 + 6992^2 .

It is not an unprimeable number, because it can be changed into a prime (128811667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4025349 + ... + 4025380.

It is an arithmetic number, because the mean of its divisors is an integer number (24957263).

Almost surely, 2^128811664 is an apocalyptic number.

It is an amenable number.

128811664 is a deficient number, since it is larger than the sum of its proper divisors (120760966).

128811664 is an equidigital number, since it uses as much as digits as its factorization.

128811664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8050737 (or 8050731 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 128811664 is about 11349.5226331331. The cubic root of 128811664 is about 505.0314184942.

The spelling of 128811664 in words is "one hundred twenty-eight million, eight hundred eleven thousand, six hundred sixty-four".