26379281889 has 9 divisors (see below), whose sum is σ = 38104110993. Its totient is φ = 17585863092.

The previous prime is 26379281867. The next prime is 26379281893. The reversal of 26379281889 is 98818297362.

The square root of 26379281889 is 162417.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-26379281889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26379281839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 460182 + ... + 514320.

Almost surely, 2^26379281889 is an apocalyptic number.

26379281889 is the 162417-th square number.

26379281889 is the 81209-th centered octagonal number.

It is an amenable number.

26379281889 is a deficient number, since it is larger than the sum of its proper divisors (11724829104).

26379281889 is an frugal number, since it uses more digits than its factorization.

26379281889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108284 (or 54142 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 26379281889 in words is "twenty-six billion, three hundred seventy-nine million, two hundred eighty-one thousand, eight hundred eighty-nine".