2780569 has 4 divisors (see below), whose sum is σ = 3033360. Its totient is φ = 2527780.

The previous prime is 2780527. The next prime is 2780597. The reversal of 2780569 is 9650872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2780569 - 2¹¹ = 2778521 is a prime.

It is a super-2 number, since 2×2780569² = 15463127927522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2780599) 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, 126379 + ... + 126400.

It is an arithmetic number, because the mean of its divisors is an integer number (758340).

2^2780569 is an apocalyptic number.

It is an amenable number.

2780569 is a deficient number, since it is larger than the sum of its proper divisors (252791).

2780569 is a wasteful number, since it uses less digits than its factorization.

2780569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252790.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 2780569 is about 1667.5038230841. The cubic root of 2780569 is about 140.6191792817.

The spelling of 2780569 in words is "two million, seven hundred eighty thousand, five hundred sixty-nine".