2857280 has 28 divisors (see below), whose sum is σ = 6804660. Its totient is φ = 1142784.

The previous prime is 2857259. The next prime is 2857297. The reversal of 2857280 is 827582.

It can be written as a sum of positive squares in 2 ways, for example, as 473344 + 2383936 = 688^2 + 1544^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an Ulam number.

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, 4145 + ... + 4784.

2^2857280 is an apocalyptic number.

2857280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2857280 is an abundant number, since it is smaller than the sum of its proper divisors (3947380).

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

2857280 is an equidigital number, since it uses as much as digits as its factorization.

2857280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8946 (or 8936 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 2857280 is about 1690.3490763745. The cubic root of 2857280 is about 141.9006115342.

The spelling of 2857280 in words is "two million, eight hundred fifty-seven thousand, two hundred eighty".