28661302220 has 24 divisors (see below), whose sum is σ = 60282659808. Its totient is φ = 11446630400.

The previous prime is 28661302213. The next prime is 28661302261. The reversal of 28661302220 is 2220316682.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1105016 + ... + 1130655.

It is an arithmetic number, because the mean of its divisors is an integer number (2511777492).

Almost surely, 2^28661302220 is an apocalyptic number.

28661302220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28661302220 is an abundant number, since it is smaller than the sum of its proper divisors (31621357588).

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

28661302220 is a wasteful number, since it uses less digits than its factorization.

28661302220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236321 (or 2236319 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 28661302220 in words is "twenty-eight billion, six hundred sixty-one million, three hundred two thousand, two hundred twenty".