320266728 has 24 divisors (see below), whose sum is σ = 867389250. Its totient is φ = 106755552.

The previous prime is 320266721. The next prime is 320266733. The reversal of 320266728 is 827662023.

320266728 is a `hidden beast` number, since 320 + 266 + 72 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 259145604 + 61121124 = 16098^2 + 7818^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 320266692 and 320266701.

It is not an unprimeable number, because it can be changed into a prime (320266721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2224003 + ... + 2224146.

Almost surely, 2^320266728 is an apocalyptic number.

It is an amenable number.

320266728 is an abundant number, since it is smaller than the sum of its proper divisors (547122522).

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

320266728 is a wasteful number, since it uses less digits than its factorization.

320266728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4448161 (or 4448154 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 320266728 is about 17895.9975413499. The cubic root of 320266728 is about 684.1803669206.

The spelling of 320266728 in words is "three hundred twenty million, two hundred sixty-six thousand, seven hundred twenty-eight".