2680640 has 28 divisors (see below), whose sum is σ = 6384036. Its totient is φ = 1072128.

The previous prime is 2680631. The next prime is 2680661. The reversal of 2680640 is 460862.

It can be written as a sum of positive squares in 2 ways, for example, as 652864 + 2027776 = 808^2 + 1424^2 .

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, 3869 + ... + 4508.

2^2680640 is an apocalyptic number.

2680640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2680640 is an abundant number, since it is smaller than the sum of its proper divisors (3703396).

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

2680640 is an equidigital number, since it uses as much as digits as its factorization.

2680640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8394 (or 8384 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 2680640 is about 1637.2660138169. The cubic root of 2680640 is about 138.9140472351.

The spelling of 2680640 in words is "two million, six hundred eighty thousand, six hundred forty".