8491680 has 72 divisors (see below), whose sum is σ = 28982772. Its totient is φ = 2264064.

The previous prime is 8491673. The next prime is 8491697. The reversal of 8491680 is 861948.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8225424 + 266256 = 2868^2 + 516^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1509 + ... + 4388.

Almost surely, 2^8491680 is an apocalyptic number.

8491680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8491680 is an abundant number, since it is smaller than the sum of its proper divisors (20491092).

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

8491680 is a wasteful number, since it uses less digits than its factorization.

8491680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5918 (or 5907 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 8491680 is about 2914.0487298602. The cubic root of 8491680 is about 204.0161463575.

The spelling of 8491680 in words is "eight million, four hundred ninety-one thousand, six hundred eighty".