26490464680 has 16 divisors (see below), whose sum is σ = 59603545620. Its totient is φ = 10596185856.

The previous prime is 26490464669. The next prime is 26490464681. The reversal of 26490464680 is 8646409462.

It can be written as a sum of positive squares in 2 ways, for example, as 26490166564 + 298116 = 162758^2 + 546^2 .

It is not an unprimeable number, because it can be changed into a prime (26490464681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331130769 + ... + 331130848.

Almost surely, 2^26490464680 is an apocalyptic number.

26490464680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26490464680 is an abundant number, since it is smaller than the sum of its proper divisors (33113080940).

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

26490464680 is a wasteful number, since it uses less digits than its factorization.

26490464680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662261628 (or 662261624 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 49.

The spelling of 26490464680 in words is "twenty-six billion, four hundred ninety million, four hundred sixty-four thousand, six hundred eighty".