8661000 has 64 divisors (see below), whose sum is σ = 27031680. Its totient is φ = 2308800.

The previous prime is 8660987. The next prime is 8661001. The reversal of 8661000 is 1668.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1557 + ... + 4443.

It is an arithmetic number, because the mean of its divisors is an integer number (422370).

Almost surely, 2^8661000 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 8661000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13515840).

8661000 is an abundant number, since it is smaller than the sum of its proper divisors (18370680).

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

8661000 is a wasteful number, since it uses less digits than its factorization.

8661000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911 (or 2897 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 8661000 is about 2942.9576959243. The cubic root of 8661000 is about 205.3632267529.

Adding to 8661000 its reverse (1668), we get a palindrome (8662668).

The spelling of 8661000 in words is "eight million, six hundred sixty-one thousand".