28021439800 has 48 divisors (see below), whose sum is σ = 65166465240. Its totient is φ = 11205717120.

The previous prime is 28021439707. The next prime is 28021439839. The reversal of 28021439800 is 893412082.

It is a self number, because there is not a number n which added to its sum of digits gives 28021439800.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 880974 + ... + 912226.

Almost surely, 2^28021439800 is an apocalyptic number.

28021439800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28021439800 is an abundant number, since it is smaller than the sum of its proper divisors (37145025440).

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

28021439800 is a wasteful number, since it uses less digits than its factorization.

28021439800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35752 (or 35743 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 28021439800 in words is "twenty-eight billion, twenty-one million, four hundred thirty-nine thousand, eight hundred".