26381720340 has 144 divisors (see below), whose sum is σ = 83109394368. Its totient is φ = 6768824832.

The previous prime is 26381720303. The next prime is 26381720401. The reversal of 26381720340 is 4302718362.

It is a happy number.

26381720340 is a `hidden beast` number, since 2 + 638 + 17 + 2 + 0 + 3 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 26381720295 and 26381720304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 493144 + ... + 544016.

It is an arithmetic number, because the mean of its divisors is an integer number (577148572).

Almost surely, 2^26381720340 is an apocalyptic number.

26381720340 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 26381720340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41554697184).

26381720340 is an abundant number, since it is smaller than the sum of its proper divisors (56727674028).

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

26381720340 is a wasteful number, since it uses less digits than its factorization.

26381720340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50998 (or 50993 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 26381720340 in words is "twenty-six billion, three hundred eighty-one million, seven hundred twenty thousand, three hundred forty".