856840620 has 96 divisors (see below), whose sum is σ = 2584350720. Its totient is φ = 211495680.

The previous prime is 856840609. The next prime is 856840631. The reversal of 856840620 is 26048658.

It is an interprime number because it is at equal distance from previous prime (856840609) and next prime (856840631).

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, 32766 + ... + 52794.

It is an arithmetic number, because the mean of its divisors is an integer number (26920320).

Almost surely, 2^856840620 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 856840620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1292175360).

856840620 is an abundant number, since it is smaller than the sum of its proper divisors (1727510100).

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

856840620 is a wasteful number, since it uses less digits than its factorization.

856840620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20095 (or 20093 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 856840620 is about 29271.8400514898. The cubic root of 856840620 is about 949.8025887127.

The spelling of 856840620 in words is "eight hundred fifty-six million, eight hundred forty thousand, six hundred twenty".