26278597 has 2 divisors, whose sum is σ = 26278598. Its totient is φ = 26278596.

The previous prime is 26278589. The next prime is 26278643. The reversal of 26278597 is 79587262.

It is an a-pointer prime, because the next prime (26278643) can be obtained adding 26278597 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23872996 + 2405601 = 4886^2 + 1551^2 .

It is a cyclic number.

It is not a de Polignac number, because 26278597 - 2³ = 26278589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26278537) 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, 13139298 + 13139299.

It is an arithmetic number, because the mean of its divisors is an integer number (13139299).

Almost surely, 2^26278597 is an apocalyptic number.

It is an amenable number.

26278597 is a deficient number, since it is larger than the sum of its proper divisors (1).

26278597 is an equidigital number, since it uses as much as digits as its factorization.

26278597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 46.

The square root of 26278597 is about 5126.2654047562. The cubic root of 26278597 is about 297.3039812242.

The spelling of 26278597 in words is "twenty-six million, two hundred seventy-eight thousand, five hundred ninety-seven".