26278457 has 2 divisors, whose sum is σ = 26278458. Its totient is φ = 26278456.

The previous prime is 26278429. The next prime is 26278477. The reversal of 26278457 is 75487262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25694761 + 583696 = 5069^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 26278457 - 2⁶ = 26278393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26278477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13139228 + 13139229.

It is an arithmetic number, because the mean of its divisors is an integer number (13139229).

Almost surely, 2^26278457 is an apocalyptic number.

It is an amenable number.

26278457 is a deficient number, since it is larger than the sum of its proper divisors (1).

26278457 is an equidigital number, since it uses as much as digits as its factorization.

26278457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 41.

The square root of 26278457 is about 5126.2517495730. The cubic root of 26278457 is about 297.3034532581.

The spelling of 26278457 in words is "twenty-six million, two hundred seventy-eight thousand, four hundred fifty-seven".