8642556 has 72 divisors (see below), whose sum is σ = 24002160. Its totient is φ = 2605824.

The previous prime is 8642533. The next prime is 8642567. The reversal of 8642556 is 6552468.

8642556 is a `hidden beast` number, since 8 + 642 + 5 + 5 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 8642556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27456 + ... + 27768.

Almost surely, 2^8642556 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 8642556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12001080).

8642556 is an abundant number, since it is smaller than the sum of its proper divisors (15359604).

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

8642556 is a wasteful number, since it uses less digits than its factorization.

8642556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 390 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 8642556 is about 2939.8224436180. The cubic root of 8642556 is about 205.2173463215.

The spelling of 8642556 in words is "eight million, six hundred forty-two thousand, five hundred fifty-six".