856320128 has 16 divisors (see below), whose sum is σ = 1705950510. Its totient is φ = 428160000.

The previous prime is 856320089. The next prime is 856320167. The reversal of 856320128 is 821023658.

It is an interprime number because it is at equal distance from previous prime (856320089) and next prime (856320167).

It can be written as a sum of positive squares in only one way, i.e., 679749184 + 176570944 = 26072^2 + 13288^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344873 + ... + 3345128.

Almost surely, 2^856320128 is an apocalyptic number.

It is an amenable number.

856320128 is a deficient number, since it is larger than the sum of its proper divisors (849630382).

856320128 is an equidigital number, since it uses as much as digits as its factorization.

856320128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6690015 (or 6690003 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 856320128 is about 29262.9480401411. The cubic root of 856320128 is about 949.6102290243.

The spelling of 856320128 in words is "eight hundred fifty-six million, three hundred twenty thousand, one hundred twenty-eight".