2578729 has 2 divisors, whose sum is σ = 2578730. Its totient is φ = 2578728.

The previous prime is 2578721. The next prime is 2578733. The reversal of 2578729 is 9278752.

2578729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2576025 + 2704 = 1605^2 + 52^2 .

It is a cyclic number.

It is not a de Polignac number, because 2578729 - 2³ = 2578721 is a prime.

It is a Chen prime.

2578729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2578691 and 2578700.

It is not a weakly prime, because it can be changed into another prime (2578721) 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 as a sum of consecutive naturals, namely, 1289364 + 1289365.

It is an arithmetic number, because the mean of its divisors is an integer number (1289365).

2^2578729 is an apocalyptic number.

It is an amenable number.

2578729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2578729 is an equidigital number, since it uses as much as digits as its factorization.

2578729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 40.

The square root of 2578729 is about 1605.8421466632. The cubic root of 2578729 is about 137.1308710900.

The spelling of 2578729 in words is "two million, five hundred seventy-eight thousand, seven hundred twenty-nine".