2780320 has 24 divisors (see below), whose sum is σ = 6568884. Its totient is φ = 1112064.

The previous prime is 2780303. The next prime is 2780329. The reversal of 2780320 is 230872.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2471184 + 309136 = 1572^2 + 556^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2780291 and 2780300.

It is not an unprimeable number, because it can be changed into a prime (2780329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8529 + ... + 8848.

2^2780320 is an apocalyptic number.

2780320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2780320 is an abundant number, since it is smaller than the sum of its proper divisors (3788564).

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

2780320 is a wasteful number, since it uses less digits than its factorization.

2780320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17392 (or 17384 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 2780320 is about 1667.4291589150. The cubic root of 2780320 is about 140.6149816731.

The spelling of 2780320 in words is "two million, seven hundred eighty thousand, three hundred twenty".