8556240 has 160 divisors (see below), whose sum is σ = 33140736. Its totient is φ = 1774080.

The previous prime is 8556211. The next prime is 8556241. The reversal of 8556240 is 426558.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8556198 and 8556207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8556241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18249 + ... + 18711.

Almost surely, 2^8556240 is an apocalyptic number.

8556240 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 8556240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16570368).

8556240 is an abundant number, since it is smaller than the sum of its proper divisors (24584496).

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

8556240 is a wasteful number, since it uses less digits than its factorization.

8556240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 8556240 is about 2925.1051263160. The cubic root of 8556240 is about 204.5318685477.

The spelling of 8556240 in words is "eight million, five hundred fifty-six thousand, two hundred forty".