28290886784 has 16 divisors (see below), whose sum is σ = 56360751270. Its totient is φ = 14145443328.

The previous prime is 28290886783. The next prime is 28290886847. The reversal of 28290886784 is 48768809282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 24608824384 + 3682062400 = 156872^2 + 60680^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (28290886783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110511149 + ... + 110511404.

Almost surely, 2^28290886784 is an apocalyptic number.

It is an amenable number.

28290886784 is a deficient number, since it is larger than the sum of its proper divisors (28069864486).

28290886784 is an equidigital number, since it uses as much as digits as its factorization.

28290886784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221022567 (or 221022555 counting only the distinct ones).

The product of its (nonzero) digits is 24772608, while the sum is 62.

The spelling of 28290886784 in words is "twenty-eight billion, two hundred ninety million, eight hundred eighty-six thousand, seven hundred eighty-four".