2635989680 has 20 divisors (see below), whose sum is σ = 6128676192. Its totient is φ = 1054395840.

The previous prime is 2635989679. The next prime is 2635989691. The reversal of 2635989680 is 869895362.

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

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16474856 + ... + 16475015.

Almost surely, 2^2635989680 is an apocalyptic number.

2635989680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2635989680 is an abundant number, since it is smaller than the sum of its proper divisors (3492686512).

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

2635989680 is a wasteful number, since it uses less digits than its factorization.

2635989680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32949884 (or 32949878 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 56.

The square root of 2635989680 is about 51341.8901093444. The cubic root of 2635989680 is about 1381.3844678981.

The spelling of 2635989680 in words is "two billion, six hundred thirty-five million, nine hundred eighty-nine thousand, six hundred eighty".