2780705 has 8 divisors (see below), whose sum is σ = 3347304. Its totient is φ = 2217600.

The previous prime is 2780693. The next prime is 2780719. The reversal of 2780705 is 5070872.

It can be written as a sum of positive squares in 4 ways, for example, as 130321 + 2650384 = 361^2 + 1628^2 .

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

It is not a de Polignac number, because 2780705 - 2⁶ = 2780641 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1445 + ... + 2765.

It is an arithmetic number, because the mean of its divisors is an integer number (418413).

2^2780705 is an apocalyptic number.

It is an amenable number.

2780705 is a deficient number, since it is larger than the sum of its proper divisors (566599).

2780705 is a wasteful number, since it uses less digits than its factorization.

2780705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 2780705 is about 1667.5446021021. The cubic root of 2780705 is about 140.6214718456.

The spelling of 2780705 in words is "two million, seven hundred eighty thousand, seven hundred five".