26405711720 has 128 divisors (see below), whose sum is σ = 64213702560. Its totient is φ = 9736028160.

The previous prime is 26405711641. The next prime is 26405711749. The reversal of 26405711720 is 2711750462.

It can be written as a sum of positive squares in 16 ways, for example, as 6040709284 + 20365002436 = 77722^2 + 142706^2 .

It is a super-2 number, since 2×26405711720² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10659122 + ... + 10661598.

Almost surely, 2^26405711720 is an apocalyptic number.

26405711720 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 26405711720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32106851280).

26405711720 is an abundant number, since it is smaller than the sum of its proper divisors (37807990840).

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

26405711720 is a wasteful number, since it uses less digits than its factorization.

26405711720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823 (or 2819 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The spelling of 26405711720 in words is "twenty-six billion, four hundred five million, seven hundred eleven thousand, seven hundred twenty".