8557440 has 64 divisors (see below), whose sum is σ = 27282960. Its totient is φ = 2281472.

The previous prime is 8557421. The next prime is 8557447. The reversal of 8557440 is 447558.

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 (8557447) by changing a digit.

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, 309 + ... + 4148.

Almost surely, 2^8557440 is an apocalyptic number.

8557440 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 8557440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13641480).

8557440 is an abundant number, since it is smaller than the sum of its proper divisors (18725520).

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

8557440 is a wasteful number, since it uses less digits than its factorization.

8557440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4479 (or 4467 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 8557440 is about 2925.3102399575. The cubic root of 8557440 is about 204.5414298647.

The spelling of 8557440 in words is "eight million, five hundred fifty-seven thousand, four hundred forty".