28544893820 has 48 divisors (see below), whose sum is σ = 64005258240. Its totient is φ = 10667528256.

The previous prime is 28544893771. The next prime is 28544893847. The reversal of 28544893820 is 2839844582.

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 15 ways as a sum of consecutive naturals, for example, 701780 + ... + 741339.

It is an arithmetic number, because the mean of its divisors is an integer number (1333442880).

Almost surely, 2^28544893820 is an apocalyptic number.

28544893820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28544893820 is an abundant number, since it is smaller than the sum of its proper divisors (35460364420).

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

28544893820 is a wasteful number, since it uses less digits than its factorization.

28544893820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443194 (or 1443192 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 53.

The spelling of 28544893820 in words is "twenty-eight billion, five hundred forty-four million, eight hundred ninety-three thousand, eight hundred twenty".