28288783821 has 16 divisors (see below), whose sum is σ = 39784458240. Its totient is φ = 17830194480.

The previous prime is 28288783793. The next prime is 28288783837. The reversal of 28288783821 is 12838788282.

It is a happy number.

It is not a de Polignac number, because 28288783821 - 2¹⁹ = 28288259533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28288783891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477405 + ... + 533378.

It is an arithmetic number, because the mean of its divisors is an integer number (2486528640).

Almost surely, 2^28288783821 is an apocalyptic number.

It is an amenable number.

28288783821 is a deficient number, since it is larger than the sum of its proper divisors (11495674419).

28288783821 is a wasteful number, since it uses less digits than its factorization.

28288783821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011296.

The product of its digits is 5505024, while the sum is 57.

The spelling of 28288783821 in words is "twenty-eight billion, two hundred eighty-eight million, seven hundred eighty-three thousand, eight hundred twenty-one".