2780269 has 4 divisors (see below), whose sum is σ = 2784796. Its totient is φ = 2775744.

The previous prime is 2780243. The next prime is 2780273. The reversal of 2780269 is 9620872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1790244 + 990025 = 1338^2 + 995^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780269 - 2¹⁷ = 2649197 is a prime.

It is a super-2 number, since 2×2780269² = 15459791424722, which contains 22 as substring.

It is a Duffinian number.

2780269 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780209) 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, 1164 + ... + 2629.

It is an arithmetic number, because the mean of its divisors is an integer number (696199).

2^2780269 is an apocalyptic number.

It is an amenable number.

2780269 is a deficient number, since it is larger than the sum of its proper divisors (4527).

2780269 is an equidigital number, since it uses as much as digits as its factorization.

2780269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4526.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 2780269 is about 1667.4138658414. The cubic root of 2780269 is about 140.6141218911.

The spelling of 2780269 in words is "two million, seven hundred eighty thousand, two hundred sixty-nine".