26638751880 has 320 divisors, whose sum is σ = 98250712560. Its totient is φ = 6432970752.

The previous prime is 26638751873. The next prime is 26638751921. The reversal of 26638751880 is 8815783662.

It can be written as a sum of positive squares in 8 ways, for example, as 14332399524 + 12306352356 = 119718^2 + 110934^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2226394 + ... + 2238326.

Almost surely, 2^26638751880 is an apocalyptic number.

26638751880 is a gapful number since it is divisible by the number (20) 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 26638751880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49125356280).

26638751880 is an abundant number, since it is smaller than the sum of its proper divisors (71611960680).

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

26638751880 is a wasteful number, since it uses less digits than its factorization.

26638751880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12022 (or 12009 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 26638751880 in words is "twenty-six billion, six hundred thirty-eight million, seven hundred fifty-one thousand, eight hundred eighty".