6615840 has 192 divisors, whose sum is σ = 26127360. Its totient is φ = 1367040.

The previous prime is 6615809. The next prime is 6615853. The reversal of 6615840 is 485166.

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

It is a junction number, because it is equal to n+sod(n) for n = 6615798 and 6615807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36871 + ... + 37049.

It is an arithmetic number, because the mean of its divisors is an integer number (136080).

Almost surely, 2^6615840 is an apocalyptic number.

6615840 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 6615840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13063680).

6615840 is an abundant number, since it is smaller than the sum of its proper divisors (19511520).

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

6615840 is a wasteful number, since it uses less digits than its factorization.

6615840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 6615840 is about 2572.1275240547. The cubic root of 6615840 is about 187.7276878432.

The spelling of 6615840 in words is "six million, six hundred fifteen thousand, eight hundred forty".