2820890 has 8 divisors (see below), whose sum is σ = 5077620. Its totient is φ = 1128352.

The previous prime is 2820889. The next prime is 2820899. The reversal of 2820890 is 980282.

It can be written as a sum of positive squares in 2 ways, for example, as 2819041 + 1849 = 1679^2 + 43^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2820899) 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, 141035 + ... + 141054.

2^2820890 is an apocalyptic number.

2820890 is a deficient number, since it is larger than the sum of its proper divisors (2256730).

2820890 is a wasteful number, since it uses less digits than its factorization.

2820890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282096.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 2820890 is about 1679.5505351135. The cubic root of 2820890 is about 141.2956257441.

The spelling of 2820890 in words is "two million, eight hundred twenty thousand, eight hundred ninety".