128318664 has 64 divisors (see below), whose sum is σ = 333627840. Its totient is φ = 41091840.

The previous prime is 128318657. The next prime is 128318689. The reversal of 128318664 is 466813821.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72834 + ... + 74574.

It is an arithmetic number, because the mean of its divisors is an integer number (5212935).

Almost surely, 2^128318664 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 128318664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166813920).

128318664 is an abundant number, since it is smaller than the sum of its proper divisors (205309176).

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

128318664 is a wasteful number, since it uses less digits than its factorization.

128318664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870 (or 1866 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 128318664 is about 11327.7828369015. The cubic root of 128318664 is about 504.3862936685.

The spelling of 128318664 in words is "one hundred twenty-eight million, three hundred eighteen thousand, six hundred sixty-four".