26997002564 has 18 divisors (see below), whose sum is σ = 54958184190. Its totient is φ = 11570143872.

The previous prime is 26997002561. The next prime is 26997002573. The reversal of 26997002564 is 46520079962.

It can be written as a sum of positive squares in only one way, i.e., 26991204100 + 5798464 = 164290^2 + 2408^2 .

It is not an unprimeable number, because it can be changed into a prime (26997002561) 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 in 5 ways as a sum of consecutive naturals, for example, 68869709 + ... + 68870100.

It is an arithmetic number, because the mean of its divisors is an integer number (3053232455).

Almost surely, 2^26997002564 is an apocalyptic number.

It is an amenable number.

26997002564 is an abundant number, since it is smaller than the sum of its proper divisors (27961181626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26997002564 is a wasteful number, since it uses less digits than its factorization.

26997002564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137739827 (or 137739818 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 26997002564 in words is "twenty-six billion, nine hundred ninety-seven million, two thousand, five hundred sixty-four".