6618240 has 128 divisors (see below), whose sum is σ = 23500800. Its totient is φ = 1760256.

The previous prime is 6618239. The next prime is 6618247. The reversal of 6618240 is 428166.

6618240 is a `hidden beast` number, since 6 + 618 + 2 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×6618240² = 87602201395200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (6618247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17089 + ... + 17471.

It is an arithmetic number, because the mean of its divisors is an integer number (183600).

Almost surely, 2^6618240 is an apocalyptic number.

6618240 is a gapful number since it is divisible by the number (60) 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 6618240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11750400).

6618240 is an abundant number, since it is smaller than the sum of its proper divisors (16882560).

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

6618240 is a wasteful number, since it uses less digits than its factorization.

6618240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 6618240 is about 2572.5940216054. The cubic root of 6618240 is about 187.7503854891.

The spelling of 6618240 in words is "six million, six hundred eighteen thousand, two hundred forty".