8638656 has 56 divisors (see below), whose sum is σ = 24621744. Its totient is φ = 2657280.

The previous prime is 8638633. The next prime is 8638661. The reversal of 8638656 is 6568368.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 766 + ... + 4226.

It is an arithmetic number, because the mean of its divisors is an integer number (439674).

Almost surely, 2^8638656 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 8638656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12310872).

8638656 is an abundant number, since it is smaller than the sum of its proper divisors (15983088).

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

8638656 is a wasteful number, since it uses less digits than its factorization.

8638656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3489 (or 3479 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 8638656 is about 2939.1590634057. The cubic root of 8638656 is about 205.1864731991.

The spelling of 8638656 in words is "eight million, six hundred thirty-eight thousand, six hundred fifty-six".