856038644 has 6 divisors (see below), whose sum is σ = 1498067634. Its totient is φ = 428019320.

The previous prime is 856038637. The next prime is 856038647. The reversal of 856038644 is 446830658.

It can be written as a sum of positive squares in only one way, i.e., 801456100 + 54582544 = 28310^2 + 7388^2 .

It is a junction number, because it is equal to n+sod(n) for n = 856038595 and 856038604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856038647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107004827 + ... + 107004834.

It is an arithmetic number, because the mean of its divisors is an integer number (249677939).

Almost surely, 2^856038644 is an apocalyptic number.

It is an amenable number.

856038644 is a deficient number, since it is larger than the sum of its proper divisors (642028990).

856038644 is a wasteful number, since it uses less digits than its factorization.

856038644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214009665 (or 214009663 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 44.

The square root of 856038644 is about 29258.1380815663. The cubic root of 856038644 is about 949.5061677156.

The spelling of 856038644 in words is "eight hundred fifty-six million, thirty-eight thousand, six hundred forty-four".