28505688384 has 56 divisors (see below), whose sum is σ = 75440487168. Its totient is φ = 9499479040.

The previous prime is 28505688373. The next prime is 28505688389. The reversal of 28505688384 is 48388650582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28505688389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 839089 + ... + 872399.

Almost surely, 2^28505688384 is an apocalyptic number.

28505688384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28505688384 is an abundant number, since it is smaller than the sum of its proper divisors (46934798784).

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

28505688384 is a wasteful number, since it uses less digits than its factorization.

28505688384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37783 (or 37773 counting only the distinct ones).

The product of its (nonzero) digits is 14745600, while the sum is 57.

The spelling of 28505688384 in words is "twenty-eight billion, five hundred five million, six hundred eighty-eight thousand, three hundred eighty-four".