26780539 has 2 divisors, whose sum is σ = 26780540. Its totient is φ = 26780538.

The previous prime is 26780527. The next prime is 26780549. The reversal of 26780539 is 93508762.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26780539 - 2¹⁵ = 26747771 is a prime.

It is not a weakly prime, because it can be changed into another prime (26780549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13390269 + 13390270.

It is an arithmetic number, because the mean of its divisors is an integer number (13390270).

Almost surely, 2^26780539 is an apocalyptic number.

26780539 is a deficient number, since it is larger than the sum of its proper divisors (1).

26780539 is an equidigital number, since it uses as much as digits as its factorization.

26780539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 26780539 is about 5174.9916908146. The cubic root of 26780539 is about 299.1849692362.

The spelling of 26780539 in words is "twenty-six million, seven hundred eighty thousand, five hundred thirty-nine".