2781085 has 8 divisors (see below), whose sum is σ = 3360600. Its totient is φ = 2209344.

The previous prime is 2781073. The next prime is 2781089. The reversal of 2781085 is 5801872.

It can be written as a sum of positive squares in 4 ways, for example, as 45369 + 2735716 = 213^2 + 1654^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2781085 - 2¹⁷ = 2650013 is a prime.

It is a d-powerful number, because it can be written as 2⁸ + 7⁷ + 8² + 1 + 0 + 8⁴ + 5⁹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1122 + ... + 2611.

It is an arithmetic number, because the mean of its divisors is an integer number (420075).

2^2781085 is an apocalyptic number.

It is an amenable number.

2781085 is a deficient number, since it is larger than the sum of its proper divisors (579515).

2781085 is a wasteful number, since it uses less digits than its factorization.

2781085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3887.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 2781085 is about 1667.6585381906. The cubic root of 2781085 is about 140.6278771428.

The spelling of 2781085 in words is "two million, seven hundred eighty-one thousand, eighty-five".