2780680 has 32 divisors (see below), whose sum is σ = 7151040. Its totient is φ = 953280.

The previous prime is 2780671. The next prime is 2780683. The reversal of 2780680 is 860872.

It is not an unprimeable number, because it can be changed into a prime (2780683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4686 + ... + 5245.

It is an arithmetic number, because the mean of its divisors is an integer number (223470).

2^2780680 is an apocalyptic number.

2780680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2780680 is an abundant number, since it is smaller than the sum of its proper divisors (4370360).

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

2780680 is a wasteful number, since it uses less digits than its factorization.

2780680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9949 (or 9945 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 2780680 is about 1667.5371060339. The cubic root of 2780680 is about 140.6210504241.

The spelling of 2780680 in words is "two million, seven hundred eighty thousand, six hundred eighty".