26803996578 has 90 divisors (see below), whose sum is σ = 63482045121. Its totient is φ = 8451917136.

The previous prime is 26803996573. The next prime is 26803996579. The reversal of 26803996578 is 87569930862.

26803996578 is a `hidden beast` number, since 26 + 8 + 0 + 39 + 9 + 6 + 578 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15454716489 + 11349280089 = 124317^2 + 106533^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=115767.

It is not an unprimeable number, because it can be changed into a prime (26803996573) 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 44 ways as a sum of consecutive naturals, for example, 39591976 + ... + 39592652.

Almost surely, 2^26803996578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26803996578

26803996578 is an abundant number, since it is smaller than the sum of its proper divisors (36678048543).

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

26803996578 is an frugal number, since it uses more digits than its factorization.

26803996578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 26803996578 in words is "twenty-six billion, eight hundred three million, nine hundred ninety-six thousand, five hundred seventy-eight".