26720563 has 2 divisors, whose sum is σ = 26720564. Its totient is φ = 26720562.

The previous prime is 26720539. The next prime is 26720567. The reversal of 26720563 is 36502762.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26720563 - 2⁹ = 26720051 is a prime.

It is not a weakly prime, because it can be changed into another prime (26720567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13360281 + 13360282.

It is an arithmetic number, because the mean of its divisors is an integer number (13360282).

Almost surely, 2^26720563 is an apocalyptic number.

26720563 is a deficient number, since it is larger than the sum of its proper divisors (1).

26720563 is an equidigital number, since it uses as much as digits as its factorization.

26720563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 26720563 is about 5169.1936508512. The cubic root of 26720563 is about 298.9614570587.

The spelling of 26720563 in words is "twenty-six million, seven hundred twenty thousand, five hundred sixty-three".