856802128 has 40 divisors (see below), whose sum is σ = 2043147008. Its totient is φ = 338954112.

The previous prime is 856802119. The next prime is 856802137. The reversal of 856802128 is 821208658.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (856802119) and next prime (856802137).

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, 292776 + ... + 295687.

Almost surely, 2^856802128 is an apocalyptic number.

It is an amenable number.

856802128 is an abundant number, since it is smaller than the sum of its proper divisors (1186344880).

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

856802128 is a wasteful number, since it uses less digits than its factorization.

856802128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588491 (or 588485 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 856802128 is about 29271.1825521280. The cubic root of 856802128 is about 949.7883657842.

The spelling of 856802128 in words is "eight hundred fifty-six million, eight hundred two thousand, one hundred twenty-eight".