66928256 has 64 divisors (see below), whose sum is σ = 139829760. Its totient is φ = 31872000.

The previous prime is 66928231. The next prime is 66928261. The reversal of 66928256 is 65282966.

It is a tau number, because it is divible by the number of its divisors (64).

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, 400685 + ... + 400851.

It is an arithmetic number, because the mean of its divisors is an integer number (2184840).

Almost surely, 2^66928256 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 66928256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69914880).

66928256 is an abundant number, since it is smaller than the sum of its proper divisors (72901504).

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

66928256 is a wasteful number, since it uses less digits than its factorization.

66928256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 301 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 66928256 is about 8180.9691357442. The cubic root of 66928256 is about 406.0097872700.

The spelling of 66928256 in words is "sixty-six million, nine hundred twenty-eight thousand, two hundred fifty-six".