26664289 has 2 divisors, whose sum is σ = 26664290. Its totient is φ = 26664288.

The previous prime is 26664241. The next prime is 26664307. The reversal of 26664289 is 98246662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14379264 + 12285025 = 3792^2 + 3505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26664289 is a prime.

It is not a weakly prime, because it can be changed into another prime (26664089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13332144 + 13332145.

It is an arithmetic number, because the mean of its divisors is an integer number (13332145).

Almost surely, 2^26664289 is an apocalyptic number.

It is an amenable number.

26664289 is a deficient number, since it is larger than the sum of its proper divisors (1).

26664289 is an equidigital number, since it uses as much as digits as its factorization.

26664289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 43.

The square root of 26664289 is about 5163.7475732263. The cubic root of 26664289 is about 298.7514367677.

The spelling of 26664289 in words is "twenty-six million, six hundred sixty-four thousand, two hundred eighty-nine".