26780391458268 has 384 divisors, whose sum is σ = 79272918466560. Its totient is φ = 6861030359040.

The previous prime is 26780391458239. The next prime is 26780391458273. The reversal of 26780391458268 is 86285419308762.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 917970930 + ... + 918000102.

It is an arithmetic number, because the mean of its divisors is an integer number (206439891840).

It is a 1-persistent number, because it is pandigital, but 2⋅26780391458268 = 53560782916536 is not.

Almost surely, 2^{26780391458268} is an apocalyptic number.

26780391458268 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 26780391458268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39636459233280).

26780391458268 is an abundant number, since it is smaller than the sum of its proper divisors (52492527008292).

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

26780391458268 is a wasteful number, since it uses less digits than its factorization.

26780391458268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29557 (or 29555 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 69.

The spelling of 26780391458268 in words is "twenty-six trillion, seven hundred eighty billion, three hundred ninety-one million, four hundred fifty-eight thousand, two hundred sixty-eight".