26440202640 has 40 divisors (see below), whose sum is σ = 81964628928. Its totient is φ = 7050720640.

The previous prime is 26440202599. The next prime is 26440202651. The reversal of 26440202640 is 4620204462.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 26440202598 and 26440202607.

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 7 ways as a sum of consecutive naturals, for example, 55083516 + ... + 55083995.

Almost surely, 2^26440202640 is an apocalyptic number.

26440202640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26440202640 is an abundant number, since it is smaller than the sum of its proper divisors (55524426288).

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

26440202640 is a wasteful number, since it uses less digits than its factorization.

26440202640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110167527 (or 110167521 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The spelling of 26440202640 in words is "twenty-six billion, four hundred forty million, two hundred two thousand, six hundred forty".