8491320 has 96 divisors (see below), whose sum is σ = 27986400. Its totient is φ = 2232576.

The previous prime is 8491319. The next prime is 8491321. The reversal of 8491320 is 231948.

8491320 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8491319) and next prime (8491321).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8491321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36966 + ... + 37194.

It is an arithmetic number, because the mean of its divisors is an integer number (291525).

Almost surely, 2^8491320 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 8491320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13993200).

8491320 is an abundant number, since it is smaller than the sum of its proper divisors (19495080).

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

8491320 is a wasteful number, since it uses less digits than its factorization.

8491320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 8491320 is about 2913.9869594767. The cubic root of 8491320 is about 204.0132632668.

The spelling of 8491320 in words is "eight million, four hundred ninety-one thousand, three hundred twenty".