6690240 has 168 divisors, whose sum is σ = 24249888. Its totient is φ = 1689600.

The previous prime is 6690239. The next prime is 6690247. The reversal of 6690240 is 420966.

It is a super-2 number, since 2×6690240² = 89518622515200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6690247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66190 + ... + 66290.

Almost surely, 2^6690240 is an apocalyptic number.

6690240 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 6690240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12124944).

6690240 is an abundant number, since it is smaller than the sum of its proper divisors (17559648).

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

6690240 is a wasteful number, since it uses less digits than its factorization.

6690240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 6690240 is about 2586.5498255398. The cubic root of 6690240 is about 188.4287783807.

The spelling of 6690240 in words is "six million, six hundred ninety thousand, two hundred forty".