2659640 has 16 divisors (see below), whose sum is σ = 5984280. Its totient is φ = 1063840.

The previous prime is 2659637. The next prime is 2659663. The reversal of 2659640 is 469562.

It is a junction number, because it is equal to n+sod(n) for n = 2659597 and 2659606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33206 + ... + 33285.

2^2659640 is an apocalyptic number.

2659640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2659640 is an abundant number, since it is smaller than the sum of its proper divisors (3324640).

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

2659640 is a wasteful number, since it uses less digits than its factorization.

2659640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66502 (or 66498 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2659640 is about 1630.8402742145. The cubic root of 2659640 is about 138.5503472680.

The spelling of 2659640 in words is "two million, six hundred fifty-nine thousand, six hundred forty".