663822 has 32 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 209304.

The previous prime is 663821. The next prime is 663823. The reversal of 663822 is 228366.

663822 is a `hidden beast` number, since 6 + 638 + 22 = 666.

It is an interprime number because it is at equal distance from previous prime (663821) and next prime (663823).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 703 + ... + 1349.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2⁶⁶³⁸²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777600).

663822 is an abundant number, since it is smaller than the sum of its proper divisors (891378).

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

663822 is a wasteful number, since it uses less digits than its factorization.

663822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 671 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 663822 is about 814.7527232234. The cubic root of 663822 is about 87.2336170639.

It can be divided in two parts, 663 and 822, that added together give a triangular number (1485 = T₅₄).

The spelling of 663822 in words is "six hundred sixty-three thousand, eight hundred twenty-two".