8661856 has 24 divisors (see below), whose sum is σ = 19489680. Its totient is φ = 3712128.

The previous prime is 8661841. The next prime is 8661871. The reversal of 8661856 is 6581668.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8661841) and next prime (8661871).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19111 + ... + 19558.

It is an arithmetic number, because the mean of its divisors is an integer number (812070).

Almost surely, 2^8661856 is an apocalyptic number.

It is an amenable number.

8661856 is an abundant number, since it is smaller than the sum of its proper divisors (10827824).

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

8661856 is a wasteful number, since it uses less digits than its factorization.

8661856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38686 (or 38678 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 8661856 is about 2943.1031242551. The cubic root of 8661856 is about 205.3699921430.

The spelling of 8661856 in words is "eight million, six hundred sixty-one thousand, eight hundred fifty-six".