8639680 has 168 divisors, whose sum is σ = 26060400. Its totient is φ = 2709504.

The previous prime is 8639663. The next prime is 8639711. The reversal of 8639680 is 869368.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 297906 + ... + 297934.

Almost surely, 2^8639680 is an apocalyptic number.

8639680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8639680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13030200).

8639680 is an abundant number, since it is smaller than the sum of its proper divisors (17420720).

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

8639680 is a wasteful number, since it uses less digits than its factorization.

8639680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 62 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 8639680 is about 2939.3332577304. Note that the first 3 decimals coincide. The cubic root of 8639680 is about 205.1945802722.

The spelling of 8639680 in words is "eight million, six hundred thirty-nine thousand, six hundred eighty".