25780457 has 2 divisors, whose sum is σ = 25780458. Its totient is φ = 25780456.

The previous prime is 25780439. The next prime is 25780477. The reversal of 25780457 is 75408752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21353641 + 4426816 = 4621^2 + 2104^2 .

It is a cyclic number.

It is not a de Polignac number, because 25780457 - 2⁸ = 25780201 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25780457.

It is not a weakly prime, because it can be changed into another prime (25780477) 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, 12890228 + 12890229.

It is an arithmetic number, because the mean of its divisors is an integer number (12890229).

Almost surely, 2^25780457 is an apocalyptic number.

It is an amenable number.

25780457 is a deficient number, since it is larger than the sum of its proper divisors (1).

25780457 is an equidigital number, since it uses as much as digits as its factorization.

25780457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 25780457 is about 5077.4459130551. The cubic root of 25780457 is about 295.4134087020.

The spelling of 25780457 in words is "twenty-five million, seven hundred eighty thousand, four hundred fifty-seven".