8661645 has 24 divisors (see below), whose sum is σ = 15230592. Its totient is φ = 4552800.

The previous prime is 8661643. The next prime is 8661673. The reversal of 8661645 is 5461668.

8661645 is a `hidden beast` number, since 8 + 6 + 6 + 1 + 645 = 666.

8661645 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8661645 - 2¹ = 8661643 is a prime.

It is a super-3 number, since 3×8661645³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 1840 + ... + 4550.

It is an arithmetic number, because the mean of its divisors is an integer number (634608).

Almost surely, 2^8661645 is an apocalyptic number.

It is an amenable number.

8661645 is a deficient number, since it is larger than the sum of its proper divisors (6568947).

8661645 is a wasteful number, since it uses less digits than its factorization.

8661645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793 (or 2790 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 8661645 is about 2943.0672775185. The cubic root of 8661645 is about 205.3683245473.

The spelling of 8661645 in words is "eight million, six hundred sixty-one thousand, six hundred forty-five".