866628 has 72 divisors (see below), whose sum is σ = 2649920. Its totient is φ = 233280.

The previous prime is 866623. The next prime is 866629. The reversal of 866628 is 826668.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 866592 and 866601.

It is not an unprimeable number, because it can be changed into a prime (866623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4698 + ... + 4878.

2⁸⁶⁶⁶²⁸ 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 866628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1324960).

866628 is an abundant number, since it is smaller than the sum of its proper divisors (1783292).

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

866628 is a wasteful number, since it uses less digits than its factorization.

866628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 212 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 866628 is about 930.9285686883. The cubic root of 866628 is about 95.3405322724.

The spelling of 866628 in words is "eight hundred sixty-six thousand, six hundred twenty-eight".