2556769 has 6 divisors (see below), whose sum is σ = 2592546. Its totient is φ = 2521440.

The previous prime is 2556761. The next prime is 2556791. The reversal of 2556769 is 9676552.

It can be written as a sum of positive squares in only one way, i.e., 2387025 + 169744 = 1545^2 + 412^2 .

It is not a de Polignac number, because 2556769 - 2³ = 2556761 is a prime.

It is a super-2 number, since 2×2556769² = 13074135438722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10489 + ... + 10729.

It is an arithmetic number, because the mean of its divisors is an integer number (432091).

2^2556769 is an apocalyptic number.

It is an amenable number.

2556769 is a deficient number, since it is larger than the sum of its proper divisors (35777).

2556769 is an equidigital number, since it uses as much as digits as its factorization.

2556769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 344 counting only the distinct ones).

The product of its digits is 113400, while the sum is 40.

The square root of 2556769 is about 1598.9899937148. The cubic root of 2556769 is about 136.7405001271.

The spelling of 2556769 in words is "two million, five hundred fifty-six thousand, seven hundred sixty-nine".