856177646 has 4 divisors (see below), whose sum is σ = 1284266472. Its totient is φ = 428088822.

The previous prime is 856177633. The next prime is 856177649. The reversal of 856177646 is 646771658.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 856177594 and 856177603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856177649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214044410 + ... + 214044413.

It is an arithmetic number, because the mean of its divisors is an integer number (321066618).

Almost surely, 2^856177646 is an apocalyptic number.

856177646 is a deficient number, since it is larger than the sum of its proper divisors (428088826).

856177646 is a wasteful number, since it uses less digits than its factorization.

856177646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428088825.

The product of its digits is 1693440, while the sum is 50.

The square root of 856177646 is about 29260.5134268010. The cubic root of 856177646 is about 949.5575579631.

The spelling of 856177646 in words is "eight hundred fifty-six million, one hundred seventy-seven thousand, six hundred forty-six".