856646658 has 64 divisors (see below), whose sum is σ = 2179749120. Its totient is φ = 244290816.

The previous prime is 856646641. The next prime is 856646671.

It is a happy number.

856646658 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 229866 + ... + 233562.

It is an arithmetic number, because the mean of its divisors is an integer number (34058580).

Almost surely, 2^856646658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856646658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1089874560).

856646658 is an abundant number, since it is smaller than the sum of its proper divisors (1323102462).

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

856646658 is a wasteful number, since it uses less digits than its factorization.

856646658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328 (or 4322 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The square root of 856646658 is about 29268.5267480275. The cubic root of 856646658 is about 949.7309147405.

The spelling of 856646658 in words is "eight hundred fifty-six million, six hundred forty-six thousand, six hundred fifty-eight".