856825872 has 160 divisors (see below), whose sum is σ = 2662996224. Its totient is φ = 232381440.

The previous prime is 856825847. The next prime is 856825883. The reversal of 856825872 is 278528658.

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, 20898172 + ... + 20898212.

Almost surely, 2^856825872 is an apocalyptic number.

856825872 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856825872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1331498112).

856825872 is an abundant number, since it is smaller than the sum of its proper divisors (1806170352).

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

856825872 is an equidigital number, since it uses as much as digits as its factorization.

856825872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 90 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 51.

The square root of 856825872 is about 29271.5881359382. The cubic root of 856825872 is about 949.7971393255.

The spelling of 856825872 in words is "eight hundred fifty-six million, eight hundred twenty-five thousand, eight hundred seventy-two".