845644 has 12 divisors (see below), whose sum is σ = 1490104. Its totient is φ = 419904.

The previous prime is 845623. The next prime is 845653. The reversal of 845644 is 446548.

It is a super-2 number, since 2×845644² = 1430227549472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4 + ... + 1300.

2⁸⁴⁵⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

845644 is a deficient number, since it is larger than the sum of its proper divisors (644460).

845644 is a wasteful number, since it uses less digits than its factorization.

845644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464 (or 1462 counting only the distinct ones).

The product of its digits is 15360, while the sum is 31.

The square root of 845644 is about 919.5890386472. The cubic root of 845644 is about 94.5647308060.

The spelling of 845644 in words is "eight hundred forty-five thousand, six hundred forty-four".