26487191808 has 720 divisors, whose sum is σ = 100647017856. Its totient is φ = 6728417280.

The previous prime is 26487191803. The next prime is 26487191837. The reversal of 26487191808 is 80819178462.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (26487191803) 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 79 ways as a sum of consecutive naturals, for example, 84623460 + ... + 84623772.

Almost surely, 2^26487191808 is an apocalyptic number.

26487191808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26487191808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50323508928).

26487191808 is an abundant number, since it is smaller than the sum of its proper divisors (74159826048).

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

26487191808 is a wasteful number, since it uses less digits than its factorization.

26487191808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 26487191808 in words is "twenty-six billion, four hundred eighty-seven million, one hundred ninety-one thousand, eight hundred eight".