8408720 has 40 divisors (see below), whose sum is σ = 19786680. Its totient is φ = 3322880.

The previous prime is 8408713. The next prime is 8408747. The reversal of 8408720 is 278048.

It can be written as a sum of positive squares in 4 ways, for example, as 1290496 + 7118224 = 1136^2 + 2668^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 6530 + ... + 7710.

It is an arithmetic number, because the mean of its divisors is an integer number (494667).

Almost surely, 2^8408720 is an apocalyptic number.

8408720 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 8408720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9893340).

8408720 is an abundant number, since it is smaller than the sum of its proper divisors (11377960).

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

8408720 is a wasteful number, since it uses less digits than its factorization.

8408720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283 (or 1277 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 8408720 is about 2899.7793019470. The cubic root of 8408720 is about 203.3495881180.

The spelling of 8408720 in words is "eight million, four hundred eight thousand, seven hundred twenty".