856755642428 has 96 divisors (see below), whose sum is σ = 1801097625600. Its totient is φ = 348895123200.

The previous prime is 856755642329. The next prime is 856755642437. The reversal of 856755642428 is 824246557658.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12377018 + ... + 12446046.

It is an arithmetic number, because the mean of its divisors is an integer number (18761433600).

Almost surely, 2^856755642428 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 856755642428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900548812800).

856755642428 is an abundant number, since it is smaller than the sum of its proper divisors (944341983172).

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

856755642428 is a wasteful number, since it uses less digits than its factorization.

856755642428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69331 (or 69329 counting only the distinct ones).

The product of its digits is 129024000, while the sum is 62.

The spelling of 856755642428 in words is "eight hundred fifty-six billion, seven hundred fifty-five million, six hundred forty-two thousand, four hundred twenty-eight".