2840720 has 20 divisors (see below), whose sum is σ = 6604860. Its totient is φ = 1136256.

The previous prime is 2840699. The next prime is 2840723. The reversal of 2840720 is 270482.

It can be written as a sum of positive squares in 2 ways, for example, as 614656 + 2226064 = 784^2 + 1492^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (2840723) 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, 17675 + ... + 17834.

It is an arithmetic number, because the mean of its divisors is an integer number (330243).

2^2840720 is an apocalyptic number.

2840720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2840720 is an abundant number, since it is smaller than the sum of its proper divisors (3764140).

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

2840720 is a wasteful number, since it uses less digits than its factorization.

2840720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35522 (or 35516 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 2840720 is about 1685.4435617961. The cubic root of 2840720 is about 141.6259413887.

The spelling of 2840720 in words is "two million, eight hundred forty thousand, seven hundred twenty".