28287511850 has 48 divisors (see below), whose sum is σ = 56721682080. Its totient is φ = 10433630400.

The previous prime is 28287511849. The next prime is 28287511919. The reversal of 28287511850 is 5811578282.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28287511795 and 28287511804.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 608741 + ... + 653559.

It is an arithmetic number, because the mean of its divisors is an integer number (1181701710).

Almost surely, 2^28287511850 is an apocalyptic number.

28287511850 is an abundant number, since it is smaller than the sum of its proper divisors (28434170230).

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

28287511850 is a wasteful number, since it uses less digits than its factorization.

28287511850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45815 (or 45810 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 47.

The spelling of 28287511850 in words is "twenty-eight billion, two hundred eighty-seven million, five hundred eleven thousand, eight hundred fifty".