856634172 has 48 divisors (see below), whose sum is σ = 2092511232. Its totient is φ = 272240320.

The previous prime is 856634153. The next prime is 856634179. The reversal of 856634172 is 271436658.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856634179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82597 + ... + 92387.

It is an arithmetic number, because the mean of its divisors is an integer number (43593984).

Almost surely, 2^856634172 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 856634172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046255616).

856634172 is an abundant number, since it is smaller than the sum of its proper divisors (1235877060).

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

856634172 is a wasteful number, since it uses less digits than its factorization.

856634172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10138 (or 10136 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 856634172 is about 29268.3134464560. The cubic root of 856634172 is about 949.7263004701.

The spelling of 856634172 in words is "eight hundred fifty-six million, six hundred thirty-four thousand, one hundred seventy-two".