28108205520 has 40 divisors (see below), whose sum is σ = 87135437856. Its totient is φ = 7495521408.

The previous prime is 28108205513. The next prime is 28108205537. The reversal of 28108205520 is 2550280182.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58558522 + ... + 58559001.

Almost surely, 2^28108205520 is an apocalyptic number.

28108205520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28108205520 is an abundant number, since it is smaller than the sum of its proper divisors (59027232336).

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

28108205520 is a wasteful number, since it uses less digits than its factorization.

28108205520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117117539 (or 117117533 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The spelling of 28108205520 in words is "twenty-eight billion, one hundred eight million, two hundred five thousand, five hundred twenty".