2778669 has 12 divisors (see below), whose sum is σ = 4059900. Its totient is φ = 1831104.

The previous prime is 2778649. The next prime is 2778673. The reversal of 2778669 is 9668772.

It is a happy number.

2778669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 260100 + 2518569 = 510^2 + 1587^2 .

It is not a de Polignac number, because 2778669 - 2¹¹ = 2776621 is a prime.

It is a super-2 number, since 2×2778669² = 15442002823122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 934 + ... + 2535.

It is an arithmetic number, because the mean of its divisors is an integer number (338325).

2^2778669 is an apocalyptic number.

It is an amenable number.

2778669 is a deficient number, since it is larger than the sum of its proper divisors (1281231).

2778669 is a wasteful number, since it uses less digits than its factorization.

2778669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3564 (or 3561 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 2778669 is about 1666.9340118913. The cubic root of 2778669 is about 140.5871429948.

The spelling of 2778669 in words is "two million, seven hundred seventy-eight thousand, six hundred sixty-nine".