28505427775884 has 24 divisors (see below), whose sum is σ = 73902960900720. Its totient is φ = 9501809258592.

The previous prime is 28505427775871. The next prime is 28505427775901. The reversal of 28505427775884 is 48857772450582.

28505427775884 is a `hidden beast` number, since 2 + 8 + 5 + 0 + 5 + 427 + 77 + 58 + 84 = 666.

It is a super-2 number, since 2×28505427775884² (a number of 28 digits) contains 22 as substring.

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, 131969572929 + ... + 131969573144.

It is an arithmetic number, because the mean of its divisors is an integer number (3079290037530).

Almost surely, 2^{28505427775884} is an apocalyptic number.

It is an amenable number.

28505427775884 is an abundant number, since it is smaller than the sum of its proper divisors (45397533124836).

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

28505427775884 is a wasteful number, since it uses less digits than its factorization.

28505427775884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263939146086 (or 263939146078 counting only the distinct ones).

The product of its (nonzero) digits is 1404928000, while the sum is 72.

The spelling of 28505427775884 in words is "twenty-eight trillion, five hundred five billion, four hundred twenty-seven million, seven hundred seventy-five thousand, eight hundred eighty-four".