2805890 has 8 divisors (see below), whose sum is σ = 5050620. Its totient is φ = 1122352.

The previous prime is 2805851. The next prime is 2805899. The reversal of 2805890 is 985082.

It can be written as a sum of positive squares in 2 ways, for example, as 2725801 + 80089 = 1651^2 + 283^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2805899) 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, 140285 + ... + 140304.

2^2805890 is an apocalyptic number.

2805890 is a deficient number, since it is larger than the sum of its proper divisors (2244730).

2805890 is a wasteful number, since it uses less digits than its factorization.

2805890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280596.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 2805890 is about 1675.0791026098. The cubic root of 2805890 is about 141.0447353986.

The spelling of 2805890 in words is "two million, eight hundred five thousand, eight hundred ninety".