866632 has 24 divisors (see below), whose sum is σ = 1762290. Its totient is φ = 399360.

The previous prime is 866629. The next prime is 866639. The reversal of 866632 is 236668.

It can be written as a sum of positive squares in 3 ways, for example, as 630436 + 236196 = 794^2 + 486^2 .

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 866594 and 866603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1032 + ... + 1672.

2⁸⁶⁶⁶³² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881145).

866632 is an abundant number, since it is smaller than the sum of its proper divisors (895658).

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

866632 is a wasteful number, since it uses less digits than its factorization.

866632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 656 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 866632 is about 930.9307170783. The cubic root of 866632 is about 95.3406789565.

The spelling of 866632 in words is "eight hundred sixty-six thousand, six hundred thirty-two".