26998380864 has 392 divisors, whose sum is σ = 98877851520. Its totient is φ = 7119332352.

The previous prime is 26998380839. The next prime is 26998380869. The reversal of 26998380864 is 46808389962.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26998380869) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 4242517 + ... + 4248875.

Almost surely, 2^26998380864 is an apocalyptic number.

26998380864 is a gapful number since it is divisible by the number (24) 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 26998380864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49438925760).

26998380864 is an abundant number, since it is smaller than the sum of its proper divisors (71879470656).

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

26998380864 is an equidigital number, since it uses as much as digits as its factorization.

26998380864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6409 (or 6384 counting only the distinct ones).

The product of its (nonzero) digits is 35831808, while the sum is 63.

The spelling of 26998380864 in words is "twenty-six billion, nine hundred ninety-eight million, three hundred eighty thousand, eight hundred sixty-four".