8128240 has 20 divisors (see below), whose sum is σ = 18898344. Its totient is φ = 3251264.

The previous prime is 8128217. The next prime is 8128243. The reversal of 8128240 is 428218.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8128243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50722 + ... + 50881.

Almost surely, 2^8128240 is an apocalyptic number.

8128240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8128240 is an abundant number, since it is smaller than the sum of its proper divisors (10770104).

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

8128240 is a wasteful number, since it uses less digits than its factorization.

8128240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101616 (or 101610 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 8128240 is about 2851.0068396972. The cubic root of 8128240 is about 201.0630067402.

The spelling of 8128240 in words is "eight million, one hundred twenty-eight thousand, two hundred forty".