28443992640 has 112 divisors (see below), whose sum is σ = 103211083392. Its totient is φ = 6501482496.

The previous prime is 28443992627. The next prime is 28443992641. The reversal of 28443992640 is 4629934482.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (28443992641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2109649 + ... + 2123088.

Almost surely, 2^28443992640 is an apocalyptic number.

28443992640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28443992640 is an abundant number, since it is smaller than the sum of its proper divisors (74767090752).

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

28443992640 is a wasteful number, since it uses less digits than its factorization.

28443992640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4232764 (or 4232754 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 51.

The spelling of 28443992640 in words is "twenty-eight billion, four hundred forty-three million, nine hundred ninety-two thousand, six hundred forty".