856722444 has 12 divisors (see below), whose sum is σ = 1999019064. Its totient is φ = 285574144.

The previous prime is 856722443. The next prime is 856722523. The reversal of 856722444 is 444227658.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 856722396 and 856722405.

It is not an unprimeable number, because it can be changed into a prime (856722443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35696757 + ... + 35696780.

It is an arithmetic number, because the mean of its divisors is an integer number (166584922).

Almost surely, 2^856722444 is an apocalyptic number.

It is an amenable number.

856722444 is an abundant number, since it is smaller than the sum of its proper divisors (1142296620).

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

856722444 is a wasteful number, since it uses less digits than its factorization.

856722444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71393544 (or 71393542 counting only the distinct ones).

The product of its digits is 430080, while the sum is 42.

The square root of 856722444 is about 29269.8213865408. The cubic root of 856722444 is about 949.7589209139.

The spelling of 856722444 in words is "eight hundred fifty-six million, seven hundred twenty-two thousand, four hundred forty-four".