28569687783844 has 81 divisors (see below), whose sum is σ = 52726707131371. Its totient is φ = 13544173305520.

The previous prime is 28569687783841. The next prime is 28569687783853. The reversal of 28569687783844 is 44838778696582.

The square root of 28569687783844 is 5345062.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28569687783841) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 32209343169 + ... + 32209344055.

Almost surely, 2^{28569687783844} is an apocalyptic number.

28569687783844 is the 5345062-nd square number.

It is an amenable number.

28569687783844 is a deficient number, since it is larger than the sum of its proper divisors (24157019347527).

28569687783844 is an frugal number, since it uses more digits than its factorization.

28569687783844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086 (or 1043 counting only the distinct ones).

The product of its digits is 31213486080, while the sum is 85.

The spelling of 28569687783844 in words is "twenty-eight trillion, five hundred sixty-nine billion, six hundred eighty-seven million, seven hundred eighty-three thousand, eight hundred forty-four".