28305719900 has 18 divisors (see below), whose sum is σ = 61423412400. Its totient is φ = 11322287920.

The previous prime is 28305719887. The next prime is 28305719917. The reversal of 28305719900 is 991750382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 141528500 + ... + 141528699.

It is an arithmetic number, because the mean of its divisors is an integer number (3412411800).

Almost surely, 2^28305719900 is an apocalyptic number.

28305719900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28305719900 is an abundant number, since it is smaller than the sum of its proper divisors (33117692500).

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

28305719900 is a wasteful number, since it uses less digits than its factorization.

28305719900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283057213 (or 283057206 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 28305719900 in words is "twenty-eight billion, three hundred five million, seven hundred nineteen thousand, nine hundred".