26450728686 has 80 divisors (see below), whose sum is σ = 62193225600. Its totient is φ = 8386239312.

The previous prime is 26450728679. The next prime is 26450728693. The reversal of 26450728686 is 68682705462.

It is an interprime number because it is at equal distance from previous prime (26450728679) and next prime (26450728693).

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

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 647125 + ... + 686783.

It is an arithmetic number, because the mean of its divisors is an integer number (777415320).

Almost surely, 2^26450728686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26450728686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31096612800).

26450728686 is an abundant number, since it is smaller than the sum of its proper divisors (35742496914).

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

26450728686 is a wasteful number, since it uses less digits than its factorization.

26450728686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39875 (or 39866 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 54.

The spelling of 26450728686 in words is "twenty-six billion, four hundred fifty million, seven hundred twenty-eight thousand, six hundred eighty-six".