128256764 has 24 divisors (see below), whose sum is σ = 236733840. Its totient is φ = 60632064.

The previous prime is 128256757. The next prime is 128256773. The reversal of 128256764 is 467652821.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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, 45212 + ... + 47964.

It is an arithmetic number, because the mean of its divisors is an integer number (9863910).

Almost surely, 2^128256764 is an apocalyptic number.

It is an amenable number.

128256764 is a deficient number, since it is larger than the sum of its proper divisors (108477076).

128256764 is a wasteful number, since it uses less digits than its factorization.

128256764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3389 (or 3387 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 128256764 is about 11325.0502868641. The cubic root of 128256764 is about 504.3051765177.

The spelling of 128256764 in words is "one hundred twenty-eight million, two hundred fifty-six thousand, seven hundred sixty-four".