26634785778 has 72 divisors (see below), whose sum is σ = 59834144448. Its totient is φ = 8562510000.

The previous prime is 26634785753. The next prime is 26634785783. The reversal of 26634785778 is 87758743662.

26634785778 is a `hidden beast` number, since 26 + 6 + 34 + 7 + 8 + 577 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5377203 + ... + 5382153.

It is an arithmetic number, because the mean of its divisors is an integer number (831029784).

Almost surely, 2^26634785778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26634785778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29917072224).

26634785778 is an abundant number, since it is smaller than the sum of its proper divisors (33199358670).

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

26634785778 is a wasteful number, since it uses less digits than its factorization.

26634785778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5332 (or 5298 counting only the distinct ones).

The product of its digits is 94832640, while the sum is 63.

The spelling of 26634785778 in words is "twenty-six billion, six hundred thirty-four million, seven hundred eighty-five thousand, seven hundred seventy-eight".