128321264 has 20 divisors (see below), whose sum is σ = 249228840. Its totient is φ = 64004160.

The previous prime is 128321257. The next prime is 128321273. The reversal of 128321264 is 462123821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2867 + ... + 16274.

It is an arithmetic number, because the mean of its divisors is an integer number (12461442).

Almost surely, 2^128321264 is an apocalyptic number.

It is an amenable number.

128321264 is a deficient number, since it is larger than the sum of its proper divisors (120907576).

128321264 is a wasteful number, since it uses less digits than its factorization.

128321264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19568 (or 19562 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 128321264 is about 11327.8975984072. The cubic root of 128321264 is about 504.3897002800.

The spelling of 128321264 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, two hundred sixty-four".