8621440 has 64 divisors (see below), whose sum is σ = 21726000. Its totient is φ = 3262464.

The previous prime is 8621429. The next prime is 8621443. The reversal of 8621440 is 441268.

8621440 = 253² + 254² + ... + 347².

8621440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8621443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11806 + ... + 12514.

Almost surely, 2^8621440 is an apocalyptic number.

8621440 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 8621440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10863000).

8621440 is an abundant number, since it is smaller than the sum of its proper divisors (13104560).

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

8621440 is a wasteful number, since it uses less digits than its factorization.

8621440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 735 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 8621440 is about 2936.2288739129. The cubic root of 8621440 is about 205.0500769989.

The spelling of 8621440 in words is "eight million, six hundred twenty-one thousand, four hundred forty".