856573536 has 192 divisors, whose sum is σ = 2808400896. Its totient is φ = 222566400.

The previous prime is 856573507. The next prime is 856573579. The reversal of 856573536 is 635375658.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 619566 + ... + 620946.

It is an arithmetic number, because the mean of its divisors is an integer number (14627088).

Almost surely, 2^856573536 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 856573536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1404200448).

856573536 is an abundant number, since it is smaller than the sum of its proper divisors (1951827360).

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

856573536 is a wasteful number, since it uses less digits than its factorization.

856573536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485 (or 1477 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 48.

The square root of 856573536 is about 29267.2775638596. The cubic root of 856573536 is about 949.7038914634.

The spelling of 856573536 in words is "eight hundred fifty-six million, five hundred seventy-three thousand, five hundred thirty-six".