8491280 has 80 divisors (see below), whose sum is σ = 23034240. Its totient is φ = 2850816.

The previous prime is 8491277. The next prime is 8491297. The reversal of 8491280 is 821948.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32912 + ... + 33168.

It is an arithmetic number, because the mean of its divisors is an integer number (287928).

Almost surely, 2^8491280 is an apocalyptic number.

8491280 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 8491280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11517120).

8491280 is an abundant number, since it is smaller than the sum of its proper divisors (14542960).

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

8491280 is a wasteful number, since it uses less digits than its factorization.

8491280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 8491280 is about 2913.9800960199. The cubic root of 8491280 is about 204.0129429184.

The spelling of 8491280 in words is "eight million, four hundred ninety-one thousand, two hundred eighty".