26684802640 has 20 divisors (see below), whose sum is σ = 62042166324. Its totient is φ = 10673921024.

The previous prime is 26684802637. The next prime is 26684802659. The reversal of 26684802640 is 4620848662.

It can be written as a sum of positive squares in 2 ways, for example, as 3830619664 + 22854182976 = 61892^2 + 151176^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166779937 + ... + 166780096.

Almost surely, 2^26684802640 is an apocalyptic number.

26684802640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26684802640 is an abundant number, since it is smaller than the sum of its proper divisors (35357363684).

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

26684802640 is a wasteful number, since it uses less digits than its factorization.

26684802640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333560046 (or 333560040 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 46.

The spelling of 26684802640 in words is "twenty-six billion, six hundred eighty-four million, eight hundred two thousand, six hundred forty".