8661646 has 16 divisors (see below), whose sum is σ = 14958720. Its totient is φ = 3684600.

The previous prime is 8661643. The next prime is 8661673. The reversal of 8661646 is 6461668.

It is a super-2 number, since 2×8661646² = 150048222858632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280 + ... + 4171.

It is an arithmetic number, because the mean of its divisors is an integer number (934920).

Almost surely, 2^8661646 is an apocalyptic number.

8661646 is a deficient number, since it is larger than the sum of its proper divisors (6297074).

8661646 is a wasteful number, since it uses less digits than its factorization.

8661646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4599.

The product of its digits is 41472, while the sum is 37.

The square root of 8661646 is about 2943.0674474093. The cubic root of 8661646 is about 205.3683324507.

The spelling of 8661646 in words is "eight million, six hundred sixty-one thousand, six hundred forty-six".