850644 has 18 divisors (see below), whose sum is σ = 2150330. Its totient is φ = 283536.

The previous prime is 850637. The next prime is 850673. The reversal of 850644 is 446058.

It can be written as a sum of positive squares in only one way, i.e., 476100 + 374544 = 690^2 + 612^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

850644 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11779 + ... + 11850.

2⁸⁵⁰⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

850644 is an abundant number, since it is smaller than the sum of its proper divisors (1299686).

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

850644 is a wasteful number, since it uses less digits than its factorization.

850644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23639 (or 23634 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 850644 is about 922.3036376378. The cubic root of 850644 is about 94.7507408458.

The spelling of 850644 in words is "eight hundred fifty thousand, six hundred forty-four".