2778673 has 2 divisors, whose sum is σ = 2778674. Its totient is φ = 2778672.

The previous prime is 2778649. The next prime is 2778689. The reversal of 2778673 is 3768772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2347024 + 431649 = 1532^2 + 657^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778673 - 2²¹ = 681521 is a prime.

It is a super-3 number, since 3×2778673³ = 64362599770233321651, which contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2778073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389336 + 1389337.

It is an arithmetic number, because the mean of its divisors is an integer number (1389337).

2^2778673 is an apocalyptic number.

It is an amenable number.

2778673 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778673 is an equidigital number, since it uses as much as digits as its factorization.

2778673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 40.

The square root of 2778673 is about 1666.9352116984. The cubic root of 2778673 is about 140.5872104549.

Subtracting 2778673 from its reverse (3768772), we obtain a palindrome (990099).

The spelling of 2778673 in words is "two million, seven hundred seventy-eight thousand, six hundred seventy-three".